Interesting and Cool Things to Know

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The Sun will become a Red Giant in about 7.7 billion years. The radius will increase by 256 times, and the outer layers of the star will reach the current orbit of the Earth.
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If we weigh the entire Solar System, it turns out that our Sun contains about 99.87% of all the matter. This is equivalent to about 333 000 Earths.
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The Sun is gradually getting hotter and brighter. In about 1.1 billion years from now, our star will become 11% brighter. Life on Earth under such conditions can only survive in the depths of the oceans at best.
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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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Paper is not what paper money is made of! The composition of 75% cotton and 25% linen is actually a conventional standard, which makes up a material highly resistant to mechanical damage.
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