Science & Mathematics Questions & Answers

Some scientist consider that sleep is an instinct, a basic need for the body and mind to relax and to escape from the responses needed while awake. We become tired in body and mind if we do not sleep, and scientists have proved that when we do sleep the electrical activity of the brain slows down, although it may be …

When people say that they see a man’s face on the Moon, they are actually seeing the uneven surface on the Moon. There are deep holes, called craters, and hills on the Moon’s surface. There is no man on the Moon. That the Moon is much smaller than the stars and even the earth. In fact, four moons put together …

Very simply because our bodies are about two thirds water. The human body contains about eleven gallons of water, and as we get rid of our body water by sweating and other means, we must replace it. The water in our bodies is not the same as ordinary drinking water, of course. There are many chemicals in it, which the …

First of all, what are vitamins? They are substances which are necessary to life, and they are produced by various plants and animals. Everybody must have these vitamins in their diet regularly to enable the body cells to grow and repair themselves. Although scientists have long and complicated names for vitamins, we know them best by their simple letters, A, …

We already know that the body contains a lot of water – in fact over 70% of the body is composed of water. But this isn’t pure water. It is a salt solution, and as we lose a certain amount of our body fluid every day, we also lose salt, which we must replace. We don’t get salt from vegetables …

You’ve been playing in the pool for almost an hour now, practicing your best underwater somersaults. Now it’s time to get out, and as you look at your hands, it’s . . . it’s . . . it’s the attack of the wrinkly fingered monster! Don’t get frightened or run for cover under your towel yet. After spending lots of …

You’ve probably heard of lots of cures for hiccups, some of which may work once or twice, and some of which may not work at all. For example, giving someone with hiccups a sudden shock, putting something cold down their back, or even drinking a glass of water upside down from the wrong side of the glass have all been …

Although we take 365 days to a year, the earth does not revolve around the sun in 365 days, 5 hours, 48 minutes, and 46 seconds to do this. The extra time is made up by adding one extra day to the end of February every four years, except in those years which can be divided evenly by 100. Then …

Hic! You’ve just hiccuped for what seems like the tenth time since you finished your big dinner. Wonder where these funny noises are coming from? The part to blame is your diaphragm, a dome-shaped muscle at the bottom of your chest, and all hiccups start here. The diaphragm almost always works perfectly. It pulls down when you inhale to help …

When we comb our hair it sometimes happens that we can hear faint crackling. The reason is that combing can create a little electricity. Electrons are taken from the atoms of the comb and are added to other atoms of the hair. It is this passing of the electrons which creates electricity.