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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What are quantum dots? Quantum dots are nanocrystals that can be used as semiconductors. You might find them in your TV screen, among many other things. Different size quantum dots produce different colors. Quantum dots are called quantum dots because they are so small. They are basically nanoparticles. The smallest ones are 2 nanometers across
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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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What is a theodolite? A theodolite is a precision instrument used in surveying. Without it, people wouldn’t have known how tall our mountains were. Theodolites are still used for surveying today, but they have changed a lot to the earlier ones used. These days, theodolites are digital. The theodolite became common in surveying in the
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What is the difference between conduction, convection, and radiation? The difference is that they are three different ways of transferring heat energy. I think we first need to look at what heat is. Heat is defined as “the transfer of thermal energy from one physical system to another system, or from one region in a
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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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What caused the Chernobyl disaster? Reactor number 4 at the Chernobyl nuclear power plant exploded after a test to simulate cooling the reactor went wrong. The disaster was blamed on the workers, but they were not trained properly, and the design of the reactor was flawed. Let’s look at how a nuclear power plant works.
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How quickly would you die in the vacuum of space? It depends on the size of the person and the situation, but the average person would probably die after a couple of minutes unprotected in the vacuum of space. When we watch movies, we often see someone lose their helmet in space and then their
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Why are some people albino? Some people are albino because they don’t produce melanin, which colors our bodies. However, any living thing that has color can be albino. The condition is called albinism. Anything that has a color pigment can be albino if that pigment isn’t produced. You can get albino fish, insects, birds, mammals,
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