How many countries are there in Africa?

There are 47 countries on the African continent, including the disputed territory of Western Sahara. However, the islands off the coast are also usually listed as African, bringing the total to 53. The island nations are Cape Verde, São Tomé and Príncipe, Madagascar, the Comoros, the Seychelles, and Mauritius.

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What organs can regenerate themselves?

The liver is the only human internal organ capable of natural regeneration of lost tissue; as little as 25% of a liver can regenerate into a whole liver. Regeneration is very rapid. The liver will return to a normal size in one to two weeks following the removal of greater than 50% of the liver by mass.

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Which animal sleeps 22 hours a day?

The sleepiest animal in the world is the koala, who sleeps 22 hours a day. Next is the sloth (20 hours), armadillo and opossum (tied at 19 hours each), lemur (16 hours), then hamster and squirrel (tied at 14 hours each).

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Is dry ice poisonous to drink with?

No it will not poison you to drink a liquid that is directly cooled by dry ice. At normal pressures there may be some gaseous CO2 dissolved in the liquid giving it a mild carbonation. However, dry ice can be dangerous to bare skin, mouth, or GI tissue if someone swallows a medium to large pieces of dry ice.

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How much do all your bones weigh?

The total weight of your bones will depends on how much your entire body weighs. Your bones will make up about 15% of your total body weight. So if you weigh 100 lbs your bones weigh about 15lbs.

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Which is the strongest muscle in the human body?

If by strongest you mean “ability to exert a force on an external object”, then a human's strongest muscle is his or her 'masseter' muscle. The masseter muscle is a thick muscle in the cheek and is located at the back of the jaw

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Is the tongue a muscle or an organ?

The tongue is a muscular organ in the mouth. The tongue is covered with moist, pink tissue called mucosa. Tiny bumps called papillae give the tongue its rough texture. Thousands of taste buds cover the surfaces of the papillae.

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What is the use of the sphygmomanometer?

A sphygmomanometer is the gauge used to measure blood pressure. The sphygmomanometer reads both systolic and diastolic pressure. A doctor takes these measurements by putting on the cuff and pumping it up, which cuts off the blood flow.

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How many bees does it take to make a tablespoon of honey?

A hive of bees must fly 55,000 miles to produce a pound of honey. One bee colony can produce 60 to 100 pounds of honey per year. An average worker bee makes only about 1/12 teaspoon of honey in its lifetime.

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Why does the moon control the tides?

The tides are due to the gravitational pull of the Moon and the Sun on the Earth. Because the gravitational force decreases as the distance squared, the part of the Earth that is closer to the Moon or the Sun is pulled a little extra and a bulge is created.

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Which planet has highest temperature?

Venus, the second closest plant to the Sun, has the highest average temperatures of any planet in our Solar System, regularly reaching temperatures over 460°C. Venus is so hot because of its proximity to the Sun and its thick atmosphere.

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Which sea on the Earth has no beaches?

The Sargasso Sea, The Sea Without A Shore. The Sargasso Sea is located in the middle of the Atlantic Ocean, just a little north of the equator. The water in the Sargasso Sea is one of the clearest in the ocean, with underwater visibility of up to and incredible 200 feet.

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How high are the clouds?

Low-level clouds lie below 6,500 feet (2,000 meters). Meteorologists refer to them as stratus clouds. They're often dense, dark, and rainy (or snowy) though they can also be cottony white clumps interspersed with blue sky. The most dramatic types of clouds are cumulus and cumulonimbus, or thunderheads.

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What kind of animals live in the desert?

There are coyotes, foxes, peccaries, tarantulas, scorpions, ring tailed cats, antelope, skunks, mule deer, boars, and in some places, lions and elephants. There is an abundance of small animals that support the deserts population of hawks, falcons, owls, roadrunners, buzzards, and eagles.

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What animals eat spiders?

Because they are small, spiders have many enemies. Larger animals, such as birds, toads, lizards and monkeys, hunt them. But they are also used as food by many smaller creatures. Ticks will attach themselves to a spider and eat away at it for a long time while the spider goes about its business.

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How many times does a bee flap its wings in a second?

"In contrast to the fruit fly that has one eightieth the body size and flaps its wings 200 times each second, the much larger honeybee flaps its wings 230 times every second."

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Which gas is known as laughing gas?

Laughing gas is nitrous oxide, N2O (more properly called dinitrogen oxide). It is a colorless gas with a sweet odor and taste. Inhalation leads to disorientation, euphoria, numbness, loss of motor coordination, dizziness, and ultimately a loss of consciousness.

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Which bird has the largest eyes?

The eye of a bird is larger compared to the size of the animal than for any other group of animals, although much of it is concealed in its skull. The Ostrich has the largest eye of any land vertebrate, with an axial length of 50 mm (2 in), twice that of the human eye.

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What oath does a doctor take?

Hippocratic Oath: Modern Version. I swear to fulfill, to the best of my ability and judgment, this covenant: I will respect the hard-won scientific gains of those physicians in whose steps I walk, and gladly share such knowledge as is mine with those who are to follow.

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What is the hormone that wakes you up?

To prepare for the stress of waking, your body releases a cocktail of stress hormones, like cortisol. Gradually, your sleep becomes lighter and lighter. And that's why you wake up before your alarm. Your body hates your alarm clock.

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