1. Mosquito repellents don't repel. They hide you. The spray blocks the mosquito's sensors so they don't know you're there.
2. Dentists have recommended that a toothbrush be kept at least 6 feet away from a toilet to avoid airborne particles resulting from the flush.
3. The liquid inside young coconuts can be used as substitute for blood plasma.
4. No piece of paper can be folded in half more than 7 times.
5. Donkeys kill more people annually than plane crashes.
6. You burn more calories sleeping than you do watching television.
7. Oak trees do not produce acorns until they are fifty years of age or older.
8. The first product to have a bar code was Wrigley's gum.
9. The king of hearts is the only king without a mustache.
10. A Boeing 747s wingspan is longer than the Wright brother's first flight.
11. American Airlines saved $40,000 in 1987 by eliminating 1 olive from each salad served in first-class.
12. Venus is the only planet that rotates clockwise.
13. Apples, not caffeine, are more efficient at waking you up in the morning.
14. The plastic things on the end of shoelaces are called aglets.
15. Most dust particles in your house are made from dead skin.
16. The first owner of the Marlboro Company died of lung cancer.
17. Michael Jordan makes more money from Nike annually than all of the Nike factory workers in Malaysia combined.
18. Marilyn Monroe had six toes. (rumor)
19. All US Presidents have worn glasses. Some just didn't like being seen wearing them in public.
20. Walt Disney was afraid of mice.
21. Pearls melt in vinegar.
22. Thirty-five percent of the people who use personal ads for dating are already married.
23. The three most valuable brand names on earth: Marlboro, Coca-Cola, and Budweiser, in that order.
24. It is possible to lead a cow upstairs...but not downstairs.
25. A duck's quack doesn't echo and no one knows why. (Or does it? http://www.acoustics.salford.ac.uk/acoustics_world/duck/duck.htm)
26. The reason firehouses have circular stairways is from the days when the engines were pulled by horses. The horses were stabled on the ground floor and figured out how to walk up straight staircases.
27. Richard Millhouse Nixon was the first US president whose name contains all the letters from the word 'criminal.' The second was William Jefferson Clinton.
28. Turtles can breathe through their butts.
29. Butterflies taste with their feet.
30. In 10 minutes, a hurricane releases more energy than all of the world's nuclear weapons combined.
31. On average, 100 people choke to death on ball-point pens every year.
32. On average people fear spiders more than they do death.
33. Ninety percent of New York City cabbies are recently arrived immigrants.
34. Elephants are the only animals that can't jump.
35. Only one person in two billion will live to be 116 or older.
36. Women blink nearly twice as much as men.
37. It's physically impossible for you to lick your elbow. (or can you? http://www.uvm.edu/~dfisher1/random/elbow.jpg http://www.uvm.edu/~dfisher1/random/elbow2.jpg)
38. The Main Library at Indiana University sinks over an inch every year because when it was built, engineers failed to take into account the weight of all the books that would occupy the building.
39. A snail can sleep for three years.
40. No word in the English language rhymes with 'MONTH.'
41. Average life span of a major league baseball: 7 pitches.
42. Our eyes are always the same size from birth, but our nose and ears never stop growing. SCARY!!!
43. The electric chair was invented by a dentist.
44. All polar bears are left handed.
45. In ancient Egypt, priests plucked EVERY hair from their bodies,
including their eyebrows and eyelashes.
46. An ostrich's eye is bigger than its brain.
47. TYPEWRITER is the longest word that can be made using the letters only on one row of the keyboard.
48. 'Go', is the shortest complete sentence in the English language.
49. If Barbie were life-size, her measurements would be 39-23-33. She would stand seven feet, two inches tall. Barbie's full name is Barbara Millicent Roberts.
50. A crocodile cannot stick its tongue out.
51. The cigarette lighter was invented before the match.
52. Almost everyone who reads this will try to lick their elbow.
Tuesday, October 13, 2009
50 Interesting Facts
1. If you are right handed, you will tend to chew your food on your right side. If you are left handed, you will tend to chew your food on your left side.
2. If you stop getting thirsty, you need to drink more water. For when a human body is dehydrated, its thirst mechanism shuts off.
3. Chewing gum while peeling onions will keep you from crying.
4. Your tongue is germ free only if it is pink. If it is white there is a thin film of bacteria on it.
5. The Mercedes-Benz motto is “Das Beste oder Nichts” meaning “the best or nothing”.
6. The Titanic was the first ship to use the SOS signal.
7. The pupil of the eye expands as much as 45 percent when a person looks at something pleasing.
8. The average person who stops smoking requires one hour less sleep a night.
9. Laughing lowers levels of stress hormones and strengthens the immune system. Six-year-olds laugh an average of 300 times a day. Adults only laugh 15 to 100 times a day.
10. The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
11. Dalmatians are born without spots.
12. Bats always turn left when exiting a cave.
13. The ‘v’ in the name of a court case does not stand for ‘versus’, but for ‘and’ (in civil proceedings) or ‘against’ (in criminal proceedings).
14. Men’s shirts have the buttons on the right, but women’s shirts have the buttons on the left.
15. The owl is the only bird to drop its upper eyelid to wink. All other birds raise their lower eyelids.
16. The reason honey is so easy to digest is that it’s already been digested by a bee.
17. Roosters cannot crow if they cannot extend their necks.
18. The color blue has a calming effect. It causes the brain to release calming hormones.
19. Every time you sneeze some of your brain cells die.
20. Your left lung is smaller than your right lung to make room for your heart.
21. The verb “cleave” is the only English word with two synonyms which are antonyms of each other: adhere and separate.
22. When you blush, the lining of your stomach also turns red.
23. When hippos are upset, their sweat turns red.
24. The first Harley Davidson motorcycle was built in 1903, and used a tomato can for a carburetor.
25. The lion that roars in the MGM logo is named Volney.
26. Google is actually the common name for a number with a million zeros.
27. Switching letters is called spoonerism. For example, saying jag of Flapan, instead of flag of Japan.
28. It cost 7 million dollars to build the Titanic and 200 million to make a film about it.
29. The attachment of the human skin to muscles is what causes dimples.
30. There are 1,792 steps to the top of the Eiffel Tower.
31. The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
32. Human hair and fingernails continue to grow after death.
33. It takes about 20 seconds for a red blood cell to circle the whole body.
34. The plastic things on the end of shoelaces are called aglets.
35. Most soccer players run 7 miles in a game.
36. The only part of the body that has no blood supply is the cornea in the eye. It takes in oxygen directly from the air.
37. Every day 200 million couples make love, 400,000 babies are born, and 140,000 people die.
38. In most watch advertisements the time displayed on the watch is 10:10 because then the arms frame the brand of the watch (and make it look like it
is smiling).
39. Colgate faced big obstacle marketing toothpaste in Spanish speaking countries. Colgate translates into the command “go hang yourself.”
40. The only 2 animals that can see behind itself without turning its head are the rabbit and the parrot.
41. Intelligent people have more zinc and copper in their hair.
42. The average person laughs 13 times a day.
43. Do you know the names of the three wise monkeys? They are:Mizaru(See no evil), Mikazaru(Hear no evil), and Mazaru(Speak no evil)
44. Women blink nearly twice as much as men.
45. German Shepherds bite humans more than any other breed of dog.
46. Large kangaroos cover more than 30 feet with each jump.
47. Whip makes a cracking sound because its tip moves faster than the speed of sound.
48. Two animal rights protesters were protesting at the cruelty of sending pigs to a slaughterhouse in Bonn. Suddenly the pigs, all two thousand of them, escaped through a broken fence and stampeded, trampling the two hapless protesters to death.
49. If a statue in the park of a person on a horse has both front legs in the air, the person died in battle; if the horse has one front leg in the air, the person died as a result of wounds received in battle; if the horse has all four legs on the ground, the person died of natural cause.
50. The human heart creates enough pressure while pumping to squirt blood 30 feet!!
2. If you stop getting thirsty, you need to drink more water. For when a human body is dehydrated, its thirst mechanism shuts off.
3. Chewing gum while peeling onions will keep you from crying.
4. Your tongue is germ free only if it is pink. If it is white there is a thin film of bacteria on it.
5. The Mercedes-Benz motto is “Das Beste oder Nichts” meaning “the best or nothing”.
6. The Titanic was the first ship to use the SOS signal.
7. The pupil of the eye expands as much as 45 percent when a person looks at something pleasing.
8. The average person who stops smoking requires one hour less sleep a night.
9. Laughing lowers levels of stress hormones and strengthens the immune system. Six-year-olds laugh an average of 300 times a day. Adults only laugh 15 to 100 times a day.
10. The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
11. Dalmatians are born without spots.
12. Bats always turn left when exiting a cave.
13. The ‘v’ in the name of a court case does not stand for ‘versus’, but for ‘and’ (in civil proceedings) or ‘against’ (in criminal proceedings).
14. Men’s shirts have the buttons on the right, but women’s shirts have the buttons on the left.
15. The owl is the only bird to drop its upper eyelid to wink. All other birds raise their lower eyelids.
16. The reason honey is so easy to digest is that it’s already been digested by a bee.
17. Roosters cannot crow if they cannot extend their necks.
18. The color blue has a calming effect. It causes the brain to release calming hormones.
19. Every time you sneeze some of your brain cells die.
20. Your left lung is smaller than your right lung to make room for your heart.
21. The verb “cleave” is the only English word with two synonyms which are antonyms of each other: adhere and separate.
22. When you blush, the lining of your stomach also turns red.
23. When hippos are upset, their sweat turns red.
24. The first Harley Davidson motorcycle was built in 1903, and used a tomato can for a carburetor.
25. The lion that roars in the MGM logo is named Volney.
26. Google is actually the common name for a number with a million zeros.
27. Switching letters is called spoonerism. For example, saying jag of Flapan, instead of flag of Japan.
28. It cost 7 million dollars to build the Titanic and 200 million to make a film about it.
29. The attachment of the human skin to muscles is what causes dimples.
30. There are 1,792 steps to the top of the Eiffel Tower.
31. The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
32. Human hair and fingernails continue to grow after death.
33. It takes about 20 seconds for a red blood cell to circle the whole body.
34. The plastic things on the end of shoelaces are called aglets.
35. Most soccer players run 7 miles in a game.
36. The only part of the body that has no blood supply is the cornea in the eye. It takes in oxygen directly from the air.
37. Every day 200 million couples make love, 400,000 babies are born, and 140,000 people die.
38. In most watch advertisements the time displayed on the watch is 10:10 because then the arms frame the brand of the watch (and make it look like it
is smiling).
39. Colgate faced big obstacle marketing toothpaste in Spanish speaking countries. Colgate translates into the command “go hang yourself.”
40. The only 2 animals that can see behind itself without turning its head are the rabbit and the parrot.
41. Intelligent people have more zinc and copper in their hair.
42. The average person laughs 13 times a day.
43. Do you know the names of the three wise monkeys? They are:Mizaru(See no evil), Mikazaru(Hear no evil), and Mazaru(Speak no evil)
44. Women blink nearly twice as much as men.
45. German Shepherds bite humans more than any other breed of dog.
46. Large kangaroos cover more than 30 feet with each jump.
47. Whip makes a cracking sound because its tip moves faster than the speed of sound.
48. Two animal rights protesters were protesting at the cruelty of sending pigs to a slaughterhouse in Bonn. Suddenly the pigs, all two thousand of them, escaped through a broken fence and stampeded, trampling the two hapless protesters to death.
49. If a statue in the park of a person on a horse has both front legs in the air, the person died in battle; if the horse has one front leg in the air, the person died as a result of wounds received in battle; if the horse has all four legs on the ground, the person died of natural cause.
50. The human heart creates enough pressure while pumping to squirt blood 30 feet!!
Monday, October 12, 2009
Leaning Tower of Pisa has never been straight
Soon after building started in 1173, the foundation of the Pisa tower settled unevenly. Construction was stopped, and was continued only a 100 year later. It then became visibly clear that the Tower of Pisa is leaning, tilting to the south.
The Leaning Tower of PisaSince regular measuring of the tower began in 1911, the top of the tower has moved 1,2 millimetres (0,05 inch) per year. Today the top of the Tower of Pisa is some 5,3m (17,4 ft) off-centre.
After the bell tower of the Cathedral of Pavia collapsed in 1989, the Consorzio Progetto Torre di Pisa (Tower of Pisa Project Consortium) commissioned engineers to stabilise the Leaning Tower. Because the Tower tilted in different directions in its first years, it is slightly curved, like a banana. Engineers are working on the footing of the Tower rather than the structure, hoping to ease the top back about 20 cm (about 8 inches). But it means that the 800-year old tower will remain leaning.
The Leaning Tower of Pisa stands in the Piazza dei Miracoli (Miracle Square) in the town of Pisa, Italy.
There are 296 steps to the top of the Leaning Tower of Pisa.
Oldest human skeleton offers new clues to evolution
(CNN) -- The oldest-known hominid skeleton was a 4-foot-tall female who walked upright more than 4 million years ago and offers new clues to how humans may have evolved, scientists say.
This sketch shows what a 4 million-year-old hominid, nicknamed Ardi, may have looked like.
This sketch shows what a 4 million-year-old hominid, nicknamed Ardi, may have looked like.
Scientists believe that the fossilized remains, which were discovered in 1994 in Ethiopia and studied for years by an international team of researchers, support beliefs that humans and chimpanzees evolved separately from a common ancestor.
"This is not an ordinary fossil. It's not a chimp. It's not a human. It shows us what we used to be," said project co-director Tim White, a paleontologist at the University of California, Berkeley.
Ardipithecus ramidus, nicknamed "Ardi," is a hominid species that lived 4.4 million years ago in what is now Aramis, Ethiopia. That makes Ardi more than a million years older than the celebrated Lucy, the partial ape-human skeleton found in Africa in 1974.
Ardi's 125-piece skeleton includes the skull, teeth, pelvis, hands and feet bones. Scientists say the data collected from Ardi's bone fragments over the past 17 years push back the story of human evolution further than previously believed.
"In fact, what Ardipithecus tells us is that we as humans have been evolving to what we are today for at least 6 million years," C. Owen Lovejoy, an evolutionary biologist at Kent State University and project anatomist, said Thursday.
Don't Miss
Analysis of Ardi's skeleton reveals that she weighed about 110 pounds, had very long arms and fingers, and possessed an opposable big toe that would have helped her grasp branches while moving through trees.
Ardi's brain was believed to be the size of a chimp's, but she also had many human-like features, such as the ability to walk upright on two legs. Her "all-purpose type" teeth indicate that she probably ate a combination of plants, fruits and small mammals, scientists say.
"The anatomy behind this behavioral combination is very unexpected and is certain to cause considerable rethinking of not only our evolutionary past, but also that of our living relatives: the great apes," said Alan Walker, professor of biological anthropology at Pennsylvania State University.
Many scientists hypothesize that humans took a different evolutionary trajectory from those of chimpanzees, bonobos and gorillas. Ardi's findings help challenge earlier beliefs that humans evolved from chimpanzees, their closest genetic relatives, scientists say.
Researchers are still trying to pinpoint when the two lineages -- chimps and humans -- split from their common ancestor.
Digging up the past has not been easy.
Scientists stumbled upon the Ardipithecus fossil in 1994 when a graduate student found a single upper molar tooth. The rest of Ardi's fossilized bones, sandwiched between layers of volcanic rock, took three years to be recovered and many more to be analyzed.
"In many ways, the discovery of Ardipithecus has been like a marathon," White said.
"Ardipithecus ramidus and its prevailing anatomy revolutionize the way most of us understood the earlier part of our evolutionary history," said team member Yohannes Haile-Selassie, paleontologist at the Cleveland Museum of Natural History.
The Ardi findings are the work of 47 paleontologists and geologists representing 10 countries. The results will be published Friday in 11 articles in a special edition of the journal Science.
Until now, Australopithecus, nicknamed "Lucy," was the oldest fossil studied by scientists seeking to explain human evolution. Lucy is believed to have lived about 3.2 million years ago in what is now Ethiopia.
Many scientists credit Ethiopia with taking the lead in helping the world better understand the origins of humans.
"This finding points to a deeper sense of our [humans'] interconnectedness," Samuel Assefa, Ethiopian ambassador to the United States, said Thursday. "We are all Ethiopians at heart."
Ardi's skeleton resides in the National Museum of Ethiopia in Addis Ababa.
Sunday, October 11, 2009
The word "dollar" has its origins in the Roman Empire
A mining hole in the mountains of Bohemia produced so much silver it became the official source of coinage for the entire Holy Roman Empire. The mine was in a valley called Joachimsthal, and the coins came to have the same name: "Joachimstalers." Over time this became shortened to "Talers" and over more time, the American pronunciation of the word became the name for the currency that you would like to have in your pocket.
The $ sign was designed in 1788 by Oliver Pollock, a New Orleans businessman, using a combination of Spanish money symbols.
The $ sign is used in many countries other than the United States, including the use for the Argentine peso, Brazilian real, Cape Verde escudo, Chilean peso, Colombian peso, Cuban peso, Dominican peso, Mexican peso, Tongan pa'anga and Uruguayan peso. Other countries that trade in their currency as dollars are Australia, Bahamas, Canada, Liberia and others
If you stack one million US$1 bills, it would be 110m (361 ft) high and weight exactly 1 ton. A million dollars' worth of $100 bills weighs only 10 kg (22 lb). One million dollars' worth of once-cent coins (100 million coins) weigh 246 tons.
This is the silver coin first struck as a "Guldiner" in 1486 in Tyrol. The name "Taler" was first given to the silver coin of the same size struck in Joachimstal in Bohemia.
The $ sign was designed in 1788 by Oliver Pollock, a New Orleans businessman, using a combination of Spanish money symbols.
The $ sign is used in many countries other than the United States, including the use for the Argentine peso, Brazilian real, Cape Verde escudo, Chilean peso, Colombian peso, Cuban peso, Dominican peso, Mexican peso, Tongan pa'anga and Uruguayan peso. Other countries that trade in their currency as dollars are Australia, Bahamas, Canada, Liberia and others
If you stack one million US$1 bills, it would be 110m (361 ft) high and weight exactly 1 ton. A million dollars' worth of $100 bills weighs only 10 kg (22 lb). One million dollars' worth of once-cent coins (100 million coins) weigh 246 tons.
This is the silver coin first struck as a "Guldiner" in 1486 in Tyrol. The name "Taler" was first given to the silver coin of the same size struck in Joachimstal in Bohemia.
Untimely inventions
In 1834, Charles Babbage (1792-1871) designed the Analytical Engine, the precursor of the computer. He was unable to obtain funding for it from the government, who thought it would be worthless.
The first fax process was patented in 1843 by Alexander Bain, but fax machines went into service only in 1964. In 1888, Frank Sprague completed an electric railway, but electric locomotives were introduced only in 1895. Eugene Ely landed a plane on a boat in 1911, but aircraft carriers weren't perfected for another 20 years.
The first parachute jump was made from a hot air balloon by Andre-Jacques Garnerinthe in France in 1793. Leonardo da Vinci made detailed sketches of parachutes in 1485. He also sketched studies for a helicopter, a tank and retractable landing gear. The first helicopter that could carry a person was flown by Paul Cornu in 1907. Tanks were first used during World War One in Cambrai, France in 1917. The first airplane with retractable landing gear was built in 1933. Da Vinci also suggested underwater breathing methods. Jacques-Yves Cousteau and Emile Gagnon introduced scuba diving only in 1943, 458 years later.
Although Alexander Fleming discovered penicillin in 1928, it was only in 1938 that Howard Florey and Ernst Chain found a way to produce it, demonstrating it only in 1942.
Adolph Fick first suggested contact lenses in 1888, and although two companies manufactured lenses out of glass, it wasn't until 1948 when Kevin Tuohy invented the soft plastic lens.
Bar codes were invented by Bernard Silver and Norman Woodland in 1948. Their system used light to read a set of concentric circles, but they had to wait two decades before the advent of computers and lasers made their system practical. (However, the bar code system in use today is the Universal Product Code, introduced by IBM in 1973. The first bar coded item sold was a pack of gum in 1974.)
Modern technology... well, somewhat...
Heron of Greece suggested the used of steam power in 50 BC. But the leaders of the day thought that it would cause unemployment which may lead to unrest and the invention ran out of steam. Steam technology known to the Chinese by 800 BC. Plato, in his Hero of Alexandria of 150 BC, mentioned some 70 steam inventions. But the steam engine reappeared again only in 1698 when Thomas Savery invented a steam pump. The first practical steam engine was the atmospheric machine of Thomas Newcomen in 1701. It was used to operate pumps on coal mines. In 1769, Nicolas Joseph Cugnot drove his steam tractor, officially the first known motorcar, down a street in Paris. In 1804, English inventor Richard Trevithick introduced the steam locomotive in Wales. In 1815, George Stephenson built the world's first workable steam locomotive.
The computer was launched in 1943, more than 100 years after Charles Babbage designed the first programmable device. Babbage dropped his idea after he couldn't raise capital for it. In 1998, the Science Museum in London, UK, built a working replica of the Babbage machine, using the materials and work methods available at Babbage's time. It worked just as Babbage had intended.
Thomas Edison invented the phonograph in 1877. Peter Carl Goldmark invented the LP record in 1948. The Compact Disc was invented by Joop Sinjou and Toshi Tada Doi in 1979. It took the CD fifteen years to replace the LP.
The first true aircraft carrier, HMS Furious, was converted from a battlecruiser into a flush-deck aircraft carrier in 1917, and it was the prototype of all flat-tops. The first aircraft carriers designed from scratch were HMS Hermes and IJN Hosho, which both were launched in 1920. HMS Furious is the only aircraft carrier which did combat operations in both World Wars. She was scrapped in 1948.
Douglas Engelbart experimented in the 1960's with light pens and steering wheels before deciding on a mouse for computer use.
The first fax process was patented in 1843 by Alexander Bain, but fax machines went into service only in 1964. In 1888, Frank Sprague completed an electric railway, but electric locomotives were introduced only in 1895. Eugene Ely landed a plane on a boat in 1911, but aircraft carriers weren't perfected for another 20 years.
The first parachute jump was made from a hot air balloon by Andre-Jacques Garnerinthe in France in 1793. Leonardo da Vinci made detailed sketches of parachutes in 1485. He also sketched studies for a helicopter, a tank and retractable landing gear. The first helicopter that could carry a person was flown by Paul Cornu in 1907. Tanks were first used during World War One in Cambrai, France in 1917. The first airplane with retractable landing gear was built in 1933. Da Vinci also suggested underwater breathing methods. Jacques-Yves Cousteau and Emile Gagnon introduced scuba diving only in 1943, 458 years later.
Although Alexander Fleming discovered penicillin in 1928, it was only in 1938 that Howard Florey and Ernst Chain found a way to produce it, demonstrating it only in 1942.
Adolph Fick first suggested contact lenses in 1888, and although two companies manufactured lenses out of glass, it wasn't until 1948 when Kevin Tuohy invented the soft plastic lens.
Bar codes were invented by Bernard Silver and Norman Woodland in 1948. Their system used light to read a set of concentric circles, but they had to wait two decades before the advent of computers and lasers made their system practical. (However, the bar code system in use today is the Universal Product Code, introduced by IBM in 1973. The first bar coded item sold was a pack of gum in 1974.)
Modern technology... well, somewhat...
Heron of Greece suggested the used of steam power in 50 BC. But the leaders of the day thought that it would cause unemployment which may lead to unrest and the invention ran out of steam. Steam technology known to the Chinese by 800 BC. Plato, in his Hero of Alexandria of 150 BC, mentioned some 70 steam inventions. But the steam engine reappeared again only in 1698 when Thomas Savery invented a steam pump. The first practical steam engine was the atmospheric machine of Thomas Newcomen in 1701. It was used to operate pumps on coal mines. In 1769, Nicolas Joseph Cugnot drove his steam tractor, officially the first known motorcar, down a street in Paris. In 1804, English inventor Richard Trevithick introduced the steam locomotive in Wales. In 1815, George Stephenson built the world's first workable steam locomotive.
The computer was launched in 1943, more than 100 years after Charles Babbage designed the first programmable device. Babbage dropped his idea after he couldn't raise capital for it. In 1998, the Science Museum in London, UK, built a working replica of the Babbage machine, using the materials and work methods available at Babbage's time. It worked just as Babbage had intended.
Thomas Edison invented the phonograph in 1877. Peter Carl Goldmark invented the LP record in 1948. The Compact Disc was invented by Joop Sinjou and Toshi Tada Doi in 1979. It took the CD fifteen years to replace the LP.
The first true aircraft carrier, HMS Furious, was converted from a battlecruiser into a flush-deck aircraft carrier in 1917, and it was the prototype of all flat-tops. The first aircraft carriers designed from scratch were HMS Hermes and IJN Hosho, which both were launched in 1920. HMS Furious is the only aircraft carrier which did combat operations in both World Wars. She was scrapped in 1948.
Douglas Engelbart experimented in the 1960's with light pens and steering wheels before deciding on a mouse for computer use.
First submarine designed in 1578
Leonardo da Vinci (1452-1519) made sketches of a submarine and William Bourne, a British mathematician, drew plans for a submarine in 1578. But it was only in 1620 that Cornelius van Drebbel, a Dutch inventor, managed to build a submarine. He wrapped a wooden rowboat tightly in waterproofed leather and had air tubes with floats to the surface to provide oxygen. Of course, there were no engines yet, so the oars went through the hull at leather gaskets. He took the first trip with 12 oarsmen in the Thames River - staying submerged for 3 hours.
The first submarine used for military purposes was built in 1776 by David Bushnell (1742-1824) of the US. His "Turtle" was a one-man, wooden submarine powered by hand-turned propellers. It was used during the American Revolution against British warships. The Turtle would approach enemy ships partially submerged to attach explosives to the ships's hull. The Turtle worked well but the explosives did not.
Two rival inventors from the US developed the first true submarines in the 1890s. The US Navy purchased submarines built by John P Holland, while Russia and Japan opted for the designs of Simon Lake. Their submarines used petrol or steam engines for surface cruising and electric motors for underwater travel. They also invented torpedoes which were propelled by small electric motors, thereby introducing one of the most dangerous weapons in the world.
Submarines are also called U-boats, which is short for Unterseeboot, the German word for undersea boat.
The first nuclear-powered submarine, the USS Nautilus, was launched in 1955. In 1958 the Nautilus made the first voyage under the polar ice pack, completing the 2945 km (1,830 miles) journey in 6 days.
The first submerged circumnavigation of earth was made in 1960 by the nuclear submarine USS Triton.
The first submarine used for military purposes was built in 1776 by David Bushnell (1742-1824) of the US. His "Turtle" was a one-man, wooden submarine powered by hand-turned propellers. It was used during the American Revolution against British warships. The Turtle would approach enemy ships partially submerged to attach explosives to the ships's hull. The Turtle worked well but the explosives did not.
Two rival inventors from the US developed the first true submarines in the 1890s. The US Navy purchased submarines built by John P Holland, while Russia and Japan opted for the designs of Simon Lake. Their submarines used petrol or steam engines for surface cruising and electric motors for underwater travel. They also invented torpedoes which were propelled by small electric motors, thereby introducing one of the most dangerous weapons in the world.
Submarines are also called U-boats, which is short for Unterseeboot, the German word for undersea boat.
The first nuclear-powered submarine, the USS Nautilus, was launched in 1955. In 1958 the Nautilus made the first voyage under the polar ice pack, completing the 2945 km (1,830 miles) journey in 6 days.
The first submerged circumnavigation of earth was made in 1960 by the nuclear submarine USS Triton.
Subscribe to:
Posts (Atom)
