How do hummingbirds flap their wings so fast? By having very strong, fast twitch chest muscles, by twisting their wings instead of flapping them, and by being able to use oxygen and energy very quickly. There are 361 species of hummingbird altogether. The smallest species grow to about 5 cm and weigh 2 grams The […]
#300 How do hummingbirds flap their wings so fast? Read More »
Why do ant bites hurt? Ants both bite and sting. They drip formic acid onto your skin and some ants inject venom. Not all ants bite. There are estimated to be 22,000 different species of ant and they are on pretty much every landmass except for Antarctica. It is estimated that ants make up between
#297 Why do ant bites hurt? Read More »
Why do we get headaches? There are many theories, but nobody actually knows. There are 200 different types of headaches, but they are divided up into primary and secondary headaches. Primary headaches are headaches that aren’t caused by a disease or damage to the brain. Secondary headaches are caused by a disease or damage to
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What makes us itch? Itching is caused by the release of the chemical histamine. There are different types of itch. Almost all animals have an itch and scratch response. Bears scratch themselves on trees and dolphins scratch themselves on rocks, or at the bottom of their tank if they are in captivity. It is an
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Why do women live longer than men? There are many reasons, but having two copies of the same sex chromosome and testosterone might be the most significant. Obviously, both men and women age. Their bodies undergo similar changes that ultimately result in death. However, across the world, women tend to live on average 8%
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How much of your liver can you live without? Surprisingly, you can survive with only 25% of your liver. Where is your liver and what does it do? The liver sits just above your stomach. It weighs about 1.5 kg and is the largest organ in the body if you don’t count the skin.
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I learned this today. Why do horses need horseshoes? They only need horseshoes if they are going to be walking on hard or rough surfaces for a long time. The hoof of a horse consists of several different parts. The part that we can see is called the wall. This is up to two centimeters
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I learned this today. How does fly spray work? By blocking the insect from using its nerves to move its muscles. There are two kinds of fly spray. There are repellents, which are sprays you apply to your body to stop insects landing on you and biting. Then there are insecticide fly sprays that kill
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I learned this today. How does a virus infect the body? By replicating itself inside the body’s living cells. A virus is not a cell. It is called a virion. A cell has a cell membrane, a nucleus, and cytoplasm. A virion doesn’t have any of that. It is made up of a set of
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I learned this today. Mosquitoes come out at dusk and are active throughout the night because the temperature is lower than during the day, it is easier to find food, and there are fewer predators around. It is not true to say that all mosquitoes come out at night. There are more than 3,000 species
#276 Why do mosquitoes come out at night? Read More »
