Soap or hand sanitizer? Soap removes germs and bacteria by killing and then washing them away, while hand sanitizer kills them. Soap and hand sanitizer deal with bacteria and things like that in different ways. One of them is more successful than the other. Let’s have a look at them both. How does soap remove […]
#1358 Soap or hand sanitizer? Read More »
How does sunscreen work? Sunscreen works by either reflecting the ultraviolet rays back up, or by absorbing the ultraviolet rays. When we go out into direct sunlight, we are coming into a lot of energy that the sun is sending our way. The sun releases energy as electromagnetic waves in a whole range of wavelengths.
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Why is soil pH important? The pH of the soil affects what kinds of nutrients and chemicals can be absorbed by water and then taken up by plants. Some plants like a high pH and some like a low pH. PH is a way of measuring how acidic or alkaline something is. PH stands for
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How do AIDS drugs work? AIDS drugs work by preventing the HIV (Human Immunodeficiency Virus) form being able to multiply. AIDS and HIV are not the same thing. AIDS stands for Acquired Immune Deficiency Syndrome. HIV causes AIDS. AIDS is the late stage of HIV infection and happens when the virus has built up to
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What is the last common chimp-human ancestor? The last common chimp-human ancestor was probably about seven million years ago, possibly, although there are no remaining fossils of this animal. It is often mistakenly said that humans evolved from chimpanzees, but this is not the case. Both chimpanzees and humans evolved from a common ancestor in
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What is sepsis? Sepsis is when the body’s immune system responds to an infection, and by doing so, causes potentially life-threatening damage to the organs. A lot of information about what sepsis does comes from the name of the disease. The word “sepsis” comes from the Greek word “sepsis”, which means putrefaction, which in turn
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What is hemophilia? Hemophilia is a genetic disorder where a person’s blood doesn’t produce enough clotting factors to clot when the person is injured. We have probably heard of hemophilia in relation to the royal families of Europe in the 19th century. Probably, most famously, Prince Alexi of the Romanov family. He was the only
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How do bears get enough food? Bears are able to find enough food because they have an incredible sense of smell, excellent vision, and they can eat almost anything. This is a slightly difficult question because there are lots of different types of bears and they are all different sizes. The polar bear is obviously
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Why are muskox invisible to satellites? Muskoxen are invisible to heat detection cameras on satellites because they are extremely well insulated by their fur. Muskox are called muskox because of the smell the males produce during mating season. They have a gland called the preputial gland which produces a strongly scented fluid. The preputial glands
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What was an auroch? An auroch is a type of wild cattle that went extinct during the Bronze Age. It is probably the wild ancestor of modern domestic cattle. There is a lot of talk about trying to bring aurochs back from extinction, but I don’t know if that will happen. The word auroch comes
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