Interesting and Cool Things to Know

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The surface temperature of the Sun is about 5500°C. What do you think the core temperature is?
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What is the average diameter of the Sun?
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A man aged 70 has spent about 23 years sleeping: 8 years for dreams and the rest 15 years for sleeping.
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The Moon's mean distance from the Earth is constantly increasing. Fortunately, the change rate is very slow—about four centimeters per year.
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Although many cats hate water, tigers are great swimmers and can cover many kilometers during hunting. Actually, they quite often play in rivers and lakes, swimming just for fun.
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