How does anesthesia work? Most anesthetics work by blocking the signals to nerves. There are some aesthetics where scientists don’t know how they work. The word “anesthesia” comes from Greek, through Latin. The Greek word was anaisthesia, and it means “lack of feeling, perception, or sensation”. The route “an” means “without”. The word was only […]
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Why do they put fluoride in water? Not a lot of countries puts fluoride in their water supply, but those that do use fluoride, do it to strengthen people’s teeth and make them more resistant to tooth decay and cavities. There are two types of fluoridated water: artificial and natural. 5 countries in the world
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Why is a pronghorn so fast? The pronghorn evolved to have phenomenal speed so that it could outrun predators that no longer exist. A pronghorn is a hoofed mammal that lives in Western and Central North America. It belongs to the artiodactyl family. This family contains antelopes, hippos, deer, giraffes, camels, and 265 other animals.
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What is junk DNA? Junk DNA is DNA that doesn’t seem to do anything. It is not part of our coding DNA. DNA is in the cell nucleus of all of our cells. DNA stands for deoxyribonucleic acid. The deoxyribo part is sugar. The nucleic acid part is a long chain like molecule. Inside the
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What do mitochondria do? Mitochondria produce almost all of the chemical energy that cells need for all of their functions. Without the mitochondria, we can’t do anything. The word “mitochondria” was created in 1898 by a microbiologist called Carl Benda. He took the Greek word “mitos”, which means “thread”, and “khondrion”, which means “little granule”.
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How does an iron lung work? An iron lung works by creating a space of negative pressure to inflate the lungs. You have probably seen images of people in an iron lung. It was typically a cylindrical contraption, slightly longer then the height of the patient. It had a hole for the head to stick
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How do circadian rhythms work? Your circadian rhythm is governed by a small group of cells in the center of the brain called the suprachiasmatic nucleus. Most living organisms has a circadian rhythm. It governs the processes of the organism and sets a cycle over a 24-hour period. The word “circadian” is from the Latin
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When did the first trees appear? The first trees appeared about 350 million years ago and they evolved from seedless plants. There had to be plants before there could be trees and the first plants evolved about 400 million years ago. The first plants evolved from a type of freshwater green algae, but there were
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Why do birds eat rocks? Birds eat rocks to grind up their food so that they can digest it more easily. Most birds swallow rocks, and the size of rocks they eat depends on the size of the birds. A small bird like a swallow will have tiny pieces of grit, and a large bird
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Why can young people learn more easily that old people? Young people can learn more easily than old people because they have greater neuroplasticity. Neuroplasticity is the brains ability to increase, change, and reorder connections. When we learn something new, our brain has to store the information somewhere. I thought that when we learned something
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