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Floating a needle on water
Thoroughly dry a steel needle. Place it on the tines of a dinner fork and gently smash the surface of the water in a dish with the fork. If you are careful the needle will float as you take the fork away. Look at the water surface closely. Can you see how the surface film seems to curve under the weight of the needle ?
what is soil erosion?
Minimally processed fresh foods Today's consumers are increasingly demanding convenient, ready-to-use and ready-to-eat foods with a fresh like quality, and containing only nat
how far the moon to the earth in kilometer?
Australopithecus-The Transitional Human Forms By about two million years ago, there were several well established hominid ancestors in Africa. One of the earliest of these i
Explain in detail about the Viruses Viruses are the ultramicroscopic parasites which always require a living h ost for their multiplication. Since they are much smaller than ba
Lifting water with air pressure Fit a test tube with a single-hole cork and glass tube. Drive out the air by boiling a little water in it. Invert it with the open end under the
Explain Interferon Interferon interferes with viruses (hence the name) and is produced by most cells in the body. Interferons, like antibodies and complements, are proteins, an
What is First Aid? First-aid is the immediate and temporary care given to the victim of an accident or sudden illness. Its purpose is to (1) help preserve life, (2) preve
Aggression as a Learned Response: To elaborate this further, let us assume that you are preparing for an exam or reading something that requires concentration. Your neighbou
The Sun is the most important star from our point of view. It is the only star close enough to be studied in considerable detail. The grandeur of the Sun is partly because of
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