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When did we get electricity?
In 1882 Edison helped form the Edison Electric Illuminating Company of New York, which brought electric light to parts of Manhattan. But progress was slow. Most Americans still lit their homes with gas light and candles for another fifty years. Only in 1925 did half of all homes in the U.S. have electric power.
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Why does water boil faster with salt?
If you look at the heat capacity of salt water, you will find that it is less than pure water. In other words, it takes less energy to raise the temperature of the salt water 1°C than pure water. This means that the salt water heats up faster and eventually gets to its boiling point first.
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What percentage of the English language is Latin?
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How long is the earth's circumference?
The circumference of Earth at the equator is about 24,902 miles (40,075 km), but from pole-to-pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid.
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How long is a day on the moon?
If you were standing on the Moon, you would always see the Earth in exactly the same position, while the stars and the Sun moved around in the sky. The Moon takes 27.3 days to complete an orbit around the Earth. And this the same amount of time that it takes to turn once on its axis.
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Which ocean is the Bermuda Triangle in?
The Bermuda Triangle, also known as the Devil's Triangle, is a loosely defined region in the western part of the North Atlantic Ocean, where a number of aircraft and ships are said to have disappeared under mysterious circumstances.
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219. How cockroach can live without head ?
A cockroach can live for a week without its head. Due to their open circulatory system, and the fact that they breathe through little holes in each of their body segments, they are not dependent on the mouth or head to breathe. The roach only dies because without a mouth, it can't drink water and dies of thirst.
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What was the first permanent Spanish settlement in what is now the United States?
Pedro Menendez de Aviles hastened across the Atlantic, his sights set on removing the French and creating a Spanish settlement. Menendez arrived in 1565 at a place he called San Augustin (St. Augustine) and established the first permanent European settlement in what is now the United States.
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What percentage of the earth's water is drinkable?
Two percent of the water on earth is glacier ice at the North and South Poles. This ice is fresh water and could be melted; however, it is too far away from where people live to be usable. Less than 1% of all the water on earth is fresh water that we can actually use.
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How long do dogs live on average?
Nearly 40% of small breed dogs live longer than 10 years, but only 13% of giant breed dogs live that long. The average 50-pound dog will live 10 to 12 years. But giant breeds such as great Danes or deerhounds are elderly at 6 to 8 years.
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What are the seas around Greece?
Greece is a country located in Southern Europe, its mainland located at the southern end of the Balkan Peninsula. Greece is surrounded on the north by Bulgaria, the Republic of Macedonia and Albania; to the west by the Ionian Sea; to the south by the Mediterranean Sea and to the east by the Aegean Sea and Turkey.
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Which bird produces milk?
The pigeon is one of only three bird species (the others being flamingos and male emperor penguins) known to produce 'milk' to feed their young. In pigeons the milk starts to be produced in the crop of the parent birds two days before eggs hatch.
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Can fish breathe out of water?
Though some fish can breathe on land taking oxygen from air, most of the fish, when taken out of water, suffocate and die. This is because gill arches of fish collapse, when taken out of water, leaving the blood vessels no longer exposed to oxygen in air.
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What mineral is the hardest?
As it says in Mohs scale, the diamond is always at the most top of the scale, being the hardest mineral. There are ten minerals in Mohs scale, talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and for last and the hardest, diamond.
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Where are bees not found?
They are found on every continent except Antarctica, in every habitat on the planet that contains insect-pollinated flowering plants. Bees are adapted for feeding on nectar and pollen, the former primarily as an energy source and the latter primarily for protein and other nutrients.
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How long is a giraffe pregnant for?
The average gestation period for giraffe is approximately 15 months (453-464 days). Giraffe give birth in a 'calving ground' and mothers will often return to where they were born to have their own babies.
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What is Thermobaric Weapons?
A thermobaric weapon is a type of explosive that utilizes oxygen from the surrounding air to generate an intense, high-temperature explosion, and in practice the blast wave typically produced by such a weapon is of a significantly longer duration than that produced by a conventional condensed explosive.
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Which country is referred to as down under?
The term Down Under is a colloquialism which is variously construed to refer to Australia and New Zealand, or to Australia or New Zealand alone. The term comes from the fact that the countries are in the Southern Hemisphere, 'below' many other countries on the globe.
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Is a volcano a type of mountain?
A volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. In simple terms a volcano is a mountain that opens downward to a pool of molten rock (magma) below the surface of the earth. It is a hole in the Earth from which molten rock and gas erupt.
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What is the enzyme that breaks down lactose?
The enzyme responsible for breaking down lactose is lactase, an enzyme found on the wall of the intestines. Lactase breaks down lactose (the sugar found in milk) into galactose and glucose.
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Is Mercury Found in Nature?
Like lead or cadmium, mercury is a constituent element of the earth, a heavy metal. In pure form, it is known alternatively as "elemental" or "metallic" mercury (also expressed as Hg(0) or Hg0). Mercury is rarely found in nature as the pure, liquid metal, but rather within compounds and inorganic salts.
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Why do flamingos stand on one leg?
Flamingos often stand on one leg, the other leg tucked beneath the body. The reason for this behaviour is not fully understood. Recent research indicates that standing on one leg may allow the birds to conserve more body heat, given that they spend a significant amount of time wading in cold water.
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How long is a kangaroo baby when it is born?
The young kangaroo, or joey, is born alive at a very immature stage when it is only about 2 cm long and weighs less than a gram. Immediately after birth it crawls up the mother's body and enters the pouch. The baby attaches its mouth to one of four teats, which then enlarges to hold the young animal in place.
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Can a shark swim backwards?
Unlike fish, sharks cannot stop suddenly or swim backwards. A shark's pectoral fins cannot bend upwards like a fish, limiting its swimming ability to forward motion. If a shark needs to move backwards, it uses gravity to fall, not swim backwards.
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What does fire in the hole mean?
"Fire in the hole" is a warning that an explosive detonation in a confined space is imminent. It originated with miners, who needed to warn their fellows that a charge had been set.
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What are the countries that surround Australia?
The nearest of these countries include Indonesia, Papua New Guinea, New Zealand, New Caledonia, the Solomon Islands and Vanuatu, which are all island nations or territories in the South-East Asian and Asia-Pacific regions.
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Do insects have lungs?
Instead of lungs, insects breathe with a network of tiny tubes called tracheae. Air enters the tubes through a row of holes along an insect's abdomen. The air then diffuses down the blind-ended tracheae. Since the biggest bugs have the longest tracheae, they should need the most oxygen to be able to breathe.
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When was the wireless phone invented?
A jazz musician named Teri Pall invented a version of the cordless phone in 1965 but could not market her invention, as its 2-mile (3.2 km) range caused its radio signals to interfere with aircraft communications. In 1968, she sold her rights to the cordless phone to a manufacturer who modified it for practical use.
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Why do lakes freeze from the top down rather than the bottom up?
The reason why ice forms on the top of lakes and ponds is that once water cools below 39 degrees Fahrenheit, it becomes lighter and less dense the more it cools. This means that water expands as it freezes into ice. As a result, ice takes up more room than the water it was made from.
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