Who invented traffic lights and where were the first ones situated?
THE FIRST traffic signal was invented by J P Knight, a railway signalling engineer. It was installed outside the Houses of Parliament in 1868 and looked like any railway signal of the time, with waving semaphore arms and red-green lamps, operated by gas, for night use. Unfortunately it exploded, killing a policeman. The accident discouraged further development until the era of the internal combustion engine. Modern traffic lights are an American invention. Red-green systems were installed in Cleveland in 1914. Three-colour signals, operated manually from a tower in the middle of the street, were installed in New York in 1918.
@askmenow
THE FIRST traffic signal was invented by J P Knight, a railway signalling engineer. It was installed outside the Houses of Parliament in 1868 and looked like any railway signal of the time, with waving semaphore arms and red-green lamps, operated by gas, for night use. Unfortunately it exploded, killing a policeman. The accident discouraged further development until the era of the internal combustion engine. Modern traffic lights are an American invention. Red-green systems were installed in Cleveland in 1914. Three-colour signals, operated manually from a tower in the middle of the street, were installed in New York in 1918.
@askmenow
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What is the book that the Statue of Liberty is holding?
The statue is of a robed female figure representing Libertas, the Roman goddess of freedom, who bears a torch and a tabula ansata (a tablet evoking the law) upon which is inscribed the date of the American Declaration of Independence, July 4, 1776.
@askmenow
The statue is of a robed female figure representing Libertas, the Roman goddess of freedom, who bears a torch and a tabula ansata (a tablet evoking the law) upon which is inscribed the date of the American Declaration of Independence, July 4, 1776.
@askmenow
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Why ants follow each other ?
It turns out that when ants find food, they secrete an invisible chemical called "trail pheromone" as they return to the next. This trail leads directly from the nest to the food source.
Otherworker ants then follow the trail right to the food . Each worker then reinforces the trail on the way back.
@askmenow
It turns out that when ants find food, they secrete an invisible chemical called "trail pheromone" as they return to the next. This trail leads directly from the nest to the food source.
Otherworker ants then follow the trail right to the food . Each worker then reinforces the trail on the way back.
@askmenow
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What the Olympic Gold medal actually made of ?
The last series of Olympic medals to be made of solid gold were awarded at the 1912 OlympicGames in Stockholm, Sweden. Olympic Gold medals are required to be made from at least 92.5% silver, and must contain a minimum of 6 grams of gold. All Olympic medals must be at least 60mm in diameter and 3mm thick.
@askmenow
The last series of Olympic medals to be made of solid gold were awarded at the 1912 OlympicGames in Stockholm, Sweden. Olympic Gold medals are required to be made from at least 92.5% silver, and must contain a minimum of 6 grams of gold. All Olympic medals must be at least 60mm in diameter and 3mm thick.
@askmenow
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What is difference between Copy Right and Patent ?
The Difference Between Copyright and Patent. Patents refer to an invention, whereas copyrights refer to the expression of an idea, such as an artistic work. They are governed by different rules, so it is important to know which is applicable to your works.
@askmenow
The Difference Between Copyright and Patent. Patents refer to an invention, whereas copyrights refer to the expression of an idea, such as an artistic work. They are governed by different rules, so it is important to know which is applicable to your works.
@askmenow
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Why do surgeons wear green or blue clothes ?
Green and blue are colors that are not bright and pleasing to eye. Also they appear clean when stained with blood.
It began with wearing white scrubs as it was considered a surgeon is more reputed if his scrubs were stained more. Later as concepts of sepsis and hygiene came along colors changed to green n blue which are neutral to eye and also instil a sense of cleanliness and authority.
@askmenow
Green and blue are colors that are not bright and pleasing to eye. Also they appear clean when stained with blood.
It began with wearing white scrubs as it was considered a surgeon is more reputed if his scrubs were stained more. Later as concepts of sepsis and hygiene came along colors changed to green n blue which are neutral to eye and also instil a sense of cleanliness and authority.
@askmenow
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What body parts of human body can be donated after death?
The entire body can be donated for training or research purposes. For the purpose of transplantation, the following can be harvested:
Liver ,Kidneys, Pancreas, Heart, Lungs, Eyes, Skin, Bone, Hands, Face .
As our techniques improve, more organs could be brought in to the fold and possibly also stored longer.
@askmenow
The entire body can be donated for training or research purposes. For the purpose of transplantation, the following can be harvested:
Liver ,Kidneys, Pancreas, Heart, Lungs, Eyes, Skin, Bone, Hands, Face .
As our techniques improve, more organs could be brought in to the fold and possibly also stored longer.
@askmenow
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Which is the only country crossed by both the equator and the Tropic of Capricorn?
The Tropic of Capricorn lies at 23.5° South of the equator and runs through Australia, Chile, southern Brazil (Brazil is the only country that passes through both the equator and a tropic), and northern South Africa.
@askmenow
The Tropic of Capricorn lies at 23.5° South of the equator and runs through Australia, Chile, southern Brazil (Brazil is the only country that passes through both the equator and a tropic), and northern South Africa.
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What is hyperloop ?
Hyperloop is a high-speed transportation system, incorporating reduced-pressure tubes in which pressurized capsules ride on an air cushion that is driven by a combination of linear induction motors and air compressors.
It is an entirely new mode of transportation that eliminates all travel complications and objections due to cost, travel time and weather conditions.
Traveling as fast as the speed of sound, the Hyperloop will be faster than today's conventional methods of transportation. At about 760 MPH.
@askmenow
Hyperloop is a high-speed transportation system, incorporating reduced-pressure tubes in which pressurized capsules ride on an air cushion that is driven by a combination of linear induction motors and air compressors.
It is an entirely new mode of transportation that eliminates all travel complications and objections due to cost, travel time and weather conditions.
Traveling as fast as the speed of sound, the Hyperloop will be faster than today's conventional methods of transportation. At about 760 MPH.
@askmenow
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What planet rotate clockwise in our solar system ?
Venus and possibly Uranus are the exceptions to the counterclockwise rotations of the planets . Venus travels around the sun once every 225 Earth days but it rotates clockwise once every 243 days. This pecular combination gives it a day with respect to the sun of 117 Earth days.
@askmenow
Venus and possibly Uranus are the exceptions to the counterclockwise rotations of the planets . Venus travels around the sun once every 225 Earth days but it rotates clockwise once every 243 days. This pecular combination gives it a day with respect to the sun of 117 Earth days.
@askmenow
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What is motion sickness ?
Motion sickness is a very common disturbance of the inner ear that is caused by repeated motion such as from the swell of the sea, the movement of a car, the motion of a plane in turbulent air, etc. Some people experience nausea and even vomiting when riding in an airplane, automobile, or amusement park ride.
@askmenow
Motion sickness is a very common disturbance of the inner ear that is caused by repeated motion such as from the swell of the sea, the movement of a car, the motion of a plane in turbulent air, etc. Some people experience nausea and even vomiting when riding in an airplane, automobile, or amusement park ride.
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What is deepest part of ocean ?
The Challenger Deep in the Mariana Trench is the deepest known point in Earth's oceans. In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 10,994 meters (36,070 feet) below sea level with an estimated vertical accuracy of ± 40 meters.
@askmenow
The Challenger Deep in the Mariana Trench is the deepest known point in Earth's oceans. In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 10,994 meters (36,070 feet) below sea level with an estimated vertical accuracy of ± 40 meters.
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Which animal has the best sense of smell?
An elephant's trunk is not only long, it is packed with five times more smell receptors than humans. And now research has found that the African elephants have the greatest sense of smell among mammals - even beating dogs including the bloodhound renowned for its sniffing ability.
@askmenow
An elephant's trunk is not only long, it is packed with five times more smell receptors than humans. And now research has found that the African elephants have the greatest sense of smell among mammals - even beating dogs including the bloodhound renowned for its sniffing ability.
@askmenow
When did Greenwich mean time start?
Greenwich Mean Time (GMT) was adopted as the world's time standard at the Washington Meridian Conference in 1884. This conference also established Universal Time, from which the international 24-hour time-zone system grew. This is why all time zones refer back to GMT on the prime meridian.
@askmenow
Greenwich Mean Time (GMT) was adopted as the world's time standard at the Washington Meridian Conference in 1884. This conference also established Universal Time, from which the international 24-hour time-zone system grew. This is why all time zones refer back to GMT on the prime meridian.
@askmenow
How long does a migraine usually last?
Migraines are disabling headaches that most likely stem from problems with the nerves and blood vessels in the head. Migraine headaches typically last from 4-72 hours. They may occur as often as several times a week to only once a year. People who have migraines are called migraineurs.
@askmenow
Migraines are disabling headaches that most likely stem from problems with the nerves and blood vessels in the head. Migraine headaches typically last from 4-72 hours. They may occur as often as several times a week to only once a year. People who have migraines are called migraineurs.
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What country does the Sahara Desert cover?
Oases support some life forms in extremely arid deserts. The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia, extends over 9,000,000 km² (over 3,475,000 sq mi) and it covers about 1/4 of the African continent
@askmenow
Oases support some life forms in extremely arid deserts. The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia, extends over 9,000,000 km² (over 3,475,000 sq mi) and it covers about 1/4 of the African continent
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What connects the Pacific Ocean and the Atlantic Ocean?
The Panama Canal is not the only water line connecting the Atlantic and Pacific Oceans. There's a place in Wyoming—deep in the Teton Wilderness Area of the Bridger-Teton National Forest—in which a creek splits in two. Like the canal, this creek connects the two oceans dividing North America in two parts.
@askmenow
The Panama Canal is not the only water line connecting the Atlantic and Pacific Oceans. There's a place in Wyoming—deep in the Teton Wilderness Area of the Bridger-Teton National Forest—in which a creek splits in two. Like the canal, this creek connects the two oceans dividing North America in two parts.
@askmenow
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