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why does looking at the sun damage your eyes

Never look at the Sun unless you are using specially designed glasses that are intended for this purpose. ... read more

stars

On a clear night, you can see thousands of stars shining in the sky. From Earth, they seem to be small points of light. Yet many of them are larger than our Sun. There are far more stars in space than you can see with the naked eye. There are so many that you could never count them all. Our Sun is a m... read more

how to make a soap powered boat

Propel a paper boat using nothing more than washing-up liquid! ... read more

how does a calculator work

Calculators translate numbers into binary code to come up with an answer. ... read more

the life cycle

The stages of human life are often described as a life cycle. For each individual, however, life is a straight line. Like a story, it has a beginning, middle, and an end. The earliest stage of life is a single cell. The cell divides and, with instructions from genes, forms different tissues. These tis... read more