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How much of air is nitrogen?
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The common name given to the atmospheric gases used in breathing and photosynthesis is air. By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.
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What part of the plant is a carrot?
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When we eat corn or peas we are eating seeds, and when we eat radish or carrot, we are eating roots. Cauliflower and broccoli plants produce flowers we like to eat. Potatoes grow under- ground, but the part we eat is not a root.
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How high can you go without oxygen?
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We pass out when the pressure drops below 57 percent of atmospheric pressure — equivalent to that at an altitude of 15,000 feet (4,572 meters). Climbers can push higher because they gradually acclimate their bodies to the drop in oxygen, but no one survives long without an oxygen tank above 26,000 feet (7925 m).
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Is a coffee bean a fruit?
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A coffee bean is a seed of the coffee plant, and is the source for coffee. It is the pit inside the red or purple fruit often referred to as a cherry. Even though they are seeds, they are referred to as 'beans' because of their resemblance to true beans.
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Which country is known as the land of the midnight sun?
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Canada (Yukon, Northwest Territories, and Nunavut), Greenland, Iceland, Finland, Norway, Russia, Sweden, and the United States (Alaska). A quarter of Finland's territory lies north of the Arctic Circle and at the country's northernmost point the sun does not set at all for 60 days during summer.
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What causes the color of the red sea?
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Located between the East African coast and the Saudi Arabian peninsula, the Red Sea got its name because of a type of algae called Trichodesmium erythraeum, which is found in the sea. When these blooms of algae die off they appear to turn the blue-green color of the ocean to a reddish-brown.
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Why does the moon appear to change shape?
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The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. When the Moon is between Earth and the Sun, the lit side is hidden from us. As it moves around Earth, more and more of the lit side comes into view.
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Do carrots help your eyesight?
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A diet of carrots won't give a blind person 20/20 vision. But the vitamins found in the vegetable can help promote overall eye health. Carrots contain beta-carotene, a substance that the body converts to vitamin A, an important nutrient for eye health.
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Why does Japan get so many earthquakes?
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Why Japan has so Many Earthquakes. Japan is located along the Pacific “ring of fire”, on the edges of several continental and oceanic tectonic plates. This is an area of high seismic and volcanic activity from New Zealand, up through Japan, across to Alaska, and down the west coasts of North and South America.
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Which canal links the Atlantic and Pacific oceans?
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The Panama Canal (Spanish: Canal de Panamá) is a 77.1-kilometre (48 mi) ship canal in Panama that connects the Atlantic Ocean (via the Caribbean Sea) to the Pacific Ocean. The canal cuts across the Isthmus of Panama and is a key conduit for international maritime trade.
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What do you call a male chicken?
Chicken is genderless, hen is the female, rooster is male, and chick refers to the younglings (of either sex). Cock is short for cockerel. When a cockerel is part of a group of hens (roost) to encourage egg laying, it's called a rooster.
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Which is the only snake that builds a nest?
The female snake, about 13 feet long, builds a nest to lay its eggs. In fact, the King Cobra is the only snake in the world that builds a nest.
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Why are icebergs made of fresh water?
True icebergs are galcier fragments that have fallen into the sea. Glaciers are made of compacted smow, which is fresh water. Additionally, "sea ice" that forms from the freezing of sea water is also basically fresh water as well. This is because when saltwater freezes, it excludes salt from the ice crystal lattice.
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What determines the pitch of the sound?
Since pitch is such a close proxy for frequency, it is almost entirely determined by how quickly the sound wave is making the air vibrate and has almost nothing to do with the intensity, or amplitude, of the wave.
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How long is a professional basketball game?
An NBA game is 4 quarters of 12 minutes each, for a total of 48 minutes. However, regulation time is stopped for many aspects of gameplay, like fouls, ball out-of-bounds, timeouts, and a 15-minute halftime. That makes the wall-clock duration of typical games 2-2.5 hours.
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Which country first adopted time zones?
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On November 2, 1868, the then-British colony of New Zealand officially adopted a standard time to be observed throughout the colony, and was perhaps the first country to do so. It was based on the longitude 172°30′ East of Greenwich, that is 11 hours 30 minutes ahead of GMT.
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How long is a cat's memory span?
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A cat's memory is thought to be at least 200 times better than a dog's. But as any cat owner knows, felines are more selective, and remember what they think is useful to them. Short term memory for a dog is about five minutes; cats remember much longer, up to 16 hours. Long term memory is harder to determine.
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Is everyone who has blue eyes related?
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If you have blue eyes, you may be related to every other blue-eyed person in the world. Researchers in Denmark have found that every person with blue eyes descends from just one "founder," an ancestor whose genes mutated 6,000 to 10,000 years ago. Before then, everyone had brown eyes.
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What does a lunar eclipse look like from Earth?
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Lunar eclipses occur when Earth's shadow blocks the sun's light, which otherwise reflects off the moon. There are three types — total, partial and penumbral — with the most dramatic being a total lunar eclipse, in which Earth's shadow completely covers the moon.
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What makes red blood cells and white blood cells?
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White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All leukocytes are produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell.
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What percentage of the human brain is water?
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"Your brain is made up of about 75 percent water" and then "The human brain is the fattest organ in the body and may consists of at least 60 percent fat". Or: "The old adage of humans only using 10% of their brain is not true.
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Do starfish have a brain?
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The nervous system of the starfish is very simple...there is no brain and there are not even any ganglia to coordinate movement. The nervous system is characterized by a nerve ring that surrounds the mouth. A radial nerve branches off of the nerve ring and extends to each arm.
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What temperature does water have to be to kill bacteria?
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Some bacteria are actually resistant to the temperature of boiling water (100 degrees C.). To kill all the bacteria, you need to raise the temperature to about 121 degrees C. To get water to this temperature, you must heat it under pressure.
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What do the gills of a fish do?
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Lungs take oxygen from the air and send carbon dioxide out through the air. Gills take oxygen out of the water and let water carry away carbon dioxide. Fish force water through their gills, where it flows past lots of tiny blood vessels.
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How many languages are there in the world?
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There are approximately 6,900 distinct languages in existence today, though there may be languages spoken in remote areas that we have yet to discover. No matter how many new languages we find, though, this number will be much lower in 100 years.
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What are our five senses?
The nervous system has a specific sensory system or organ, dedicated to each sense. Humans have a multitude of senses. Sight (ophthalmoception), hearing (audioception), taste (gustaoception), smell (olfacoception or olfacception), and touch (tactioception) are the five traditionally recognized.
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Why do we have eyebrows?
Scientists aren't entirely sure why we kept this hair, but they have a pretty good guess. We know that eyebrows help keep moisture out of our eyes when we sweat or walk around in the rain. The arch shape diverts the rain or sweat around to the sides of our face, keeping our eyes relatively dry.
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What country has the Gobi desert in it?
The Gobi is a large desert region in northern China and southern Mongolia. The desert basins of the Gobi are bounded by the Altai mountains and the grasslands and steppes of Mongolia on the north, by the Tibetan Plateau to the southwest, and by the North China Plain to the southwest.
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Which is the largest landlocked country?
The largest country with no border-access to the open ocean is Kazakhstan, which has an area of 2,724,900 km² (1,052,100 mile²) and is bordered by Russia, China, Kyrgystan, Uzbekistan, Turkmenistan, and the landlocked Caspian Sea.
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Who invented the cigarette?
The first commercial cigarettes were made in 1865 by Washington Duke on his 300-acre farm in Raleigh, North Carolina. His hand-rolled cigarettes were sold to soldiers at the end of the Civil War. It was not until James Bonsack invented the cigarette-making machine in 1881 that cigarette smoking became widespread.
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