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Why is glass clear?

If the Earth were one giant atom, the nucleus would be so small it would fit inside a baseball stadium. That means the rest of the world would just be electrons. So, if atoms are made of basically empty space, why doesn’t light pass right through them? Why isn’t everything and everyone transparent? And what makes some objects, like glass, see-through?

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Stop robocalls once and for all

Robocalls are not only annoying, but they scam Americans out of millions every year. Learn Kim's tricks for stopping them for good in this handy guide.

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