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Why do stars appear to move across the sky?

Stars stay in the same patterns as they move across Earth's night sky. This, over the centuries, has given rise to groups of stars being named as constellations, because they created shapes or helped travelers find their way long before the world had things like GPS systems or maps on phones, as the stars themselves do not change positions.

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What did Galileo wear?

Galileo was born in 1564 and died in 1642. During his lifetime, most men of the middle and upper classes wore a close-cut padded jacket over a linen shirt with deep cuffs. They also wore knee breeches that were fastened to their doublets by laces or ties and were worn with knee-length stockings. Short cloaks or capes were worn except in inclement weather, when longer cloaks were worn. Men also wore hats with a tall crown and shoes cut with a tongue.

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What are some instruments that calculate cubic feet per minute?

Volumetric flow meters come in various forms. Some rely on gravity and have spherical balls inside conical tubes. As air flows through this type of flow meter, the ball rises, and graduations on the outside of the device indicate the volume of fluid flowing through the meter.\nOther flow meters have dial indicators that provide observers with analogue readings of the rates of flow. Flow meters with digital readouts are also widely available as of 2015. These types of flow meters are called positive displacement flow meters. Some flow meters do not measure flow rate directly but instead infer f..

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What is the difference between an acid versus a base?

Acids and bases are chemical opposites. Adding a basic solution to an acidic one neutralize the acid. For example, adding sodium hydroxide (NaOH) to hydrochloric acid (HCl) results in a solution of table salt (NaCl) and water. Antacids, such as sodium bicarbonate, are bases that work by neutralizing stomach acids. The strength of an acid or a base depends upon how completely the H+ or OH- ions disassociate in solution.\nThe scale for measuring acidity is called the pH scale. Acids have a pH between 7 and 0, with the strongest acids being closest to 0. Bases have a pH between 7 and 14, with the..

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How does a cathode ray tube work?

Cathode ray tubes were often used in older models of television sets. They were typically set up with multiple tubes, or "guns," that pointed to green, red and blue pixels on a screen. The electrons would be funneled to the correct color using some sort of deflection method, usually magnetic.

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How many volcanoes erupt each year?

Sometimes, one volcanic eruption can trigger other eruptions in volcanoes that are close by. Generally, the larger a volcano is, the more likely it is that its eruption will trigger other volcanoes into erupting at around the same time.Most often, volcanic eruptions are brought on by earthquakes or tectonic movement. For example, in 1868, a large earthquake hit the island of Hawaii. The earthquake was almost immediately followed up by a small eruption from Kilauea's southwest rift zone. During that volcano, the Kilauea Iki crater filled with lava.

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How long is one year on Jupiter?

Jupiter is the fifth and largest planet in the solar system. While it has one of the least eccentric orbits of any object in the solar system, Jupiter's distance from the sun still varies by as much as 76 million kilometers. While Jupiter's year is almost 12 times longer than an Earth year, its high rate of rotation means that a single day on Jupiter lasts just under 10 hours.

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What are the benefits of transgenic animals?

Transgenic animals have a gene from another species introduced into their genome, according to the Nature Education Knowledge Project. The biotechnological process of creating transgenic animals is faster than hybridizing or crossbreeding livestock. The offspring of the genetically enhanced animals can inherit the modified genetic sequence. There are several benefits from this type of modification for animals, humans and the environment.It is possible to create transgenic animals that have a higher disease resistance than those with unmodified genomes. This feature improves the welfare of the ..

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What is pulmonary infiltation and atelectasis of the left lower lobe?

Pulmonary infiltrates, such as infections resulting in pneumonia or severe ailments like cystic fibrosis, can cause atelectasis. Other causes of atelectasis may be due to post-surgery complications. In differentiating between a pulmonary infiltrate and atelectasis, the lung volume is measured because its visual density is not enough to distinguish between the two. Patients with an atelectasis will have a loss of lung volume, whereas patients with an infiltrate will have a gain in lung volume.Symptoms of an atelectasis include chest pain, difficulty breathing and coughing. Common treatments for..

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What is an inflammatory response?

An inflammatory response occurs when tissues are attacked by toxins or bacteria or injured by heat or other causes. It is a part of the healing process, typically causing the affected area to swell and become hot. Redness, pain and tenderness are associated symptoms of inflammation.\nInflammation causes the cells affected by injury to release chemicals as a response. These chemicals cause surrounding blood vessels to leak fluids into the area. These fluids cause the cells to swell, which serves to isolate the region, keeping the cause of injury away from any surrounding healthy tissues.

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