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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 ?
write 2 kinds of energy sources
Pollution due to Noise: Sound is an important means of communication, but high levels of noise could damage hearing, and cause deterioration in capacity to concentrate on
Explain Vaginal Bacteria - External Defence Mechanism Vaginal bacteria: Certain bacteria normally live in the vagina. They produce lactic acid, which kills the bacteria. Hence,
How do time and temperature work in soil formation? The time taken for the soil formation may be more in some cases or less in others. Hard rocks require more time as comp
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Define the Levels of Drugs in Urine Levels of alcohol and barbiturates (a group of drugs derived from barbituric acid that is used to sedate, to control convulsions or to induc
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where did people come from
Saturn-the Ringed Planet Saturn, the sixth planet, is the last one visible to the naked eye. Its rings, visible only through a telescope, make it the most striking and beaut
Dietary Requirement during Fever and Infection: During fever, there is a break down of tissue proteins, and water and salts are lost. The BMR increases with the rise of ever
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