All elements with an atomic number greater than what number are unstable?
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What is Heat ?
Why in cold countries, the water at the surface freezes and in the inner portion it is in the sate of water ?
How dies fanning produce a sense of coolness to the face ?
Explain the Mortar ?
If the moons orbit is inclined slightly relative to the earths orbit what effect does this have on eclipses?
Why is ice wrapped in gunny bags ?
Why gave we to put back the clock continually, when we travel round the world west-wards ?
Why does oil rise up the wick of the capillary ?
What is soft water?
What is the law of machines?
A burn from steam is more painful than that from boiling water. Why ?
If the distance separating two charges is doubled, the force between them decreases by what multiple factor?