The longest time without sleep is 11 days.

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The heart pumps 7,000-10,000 litres of blood in a 24-hour period.

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Sleeping more than 8 hours reduces life by 5-7%.

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Oxygen is needed for combustion and hydrogen is a combustible gas, but together they make up water, which not only does not burn, but is also able to put out the fire.

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The human eye can see up to 48 kilometers away

If the Earth were completely flat, we could clearly see the flickering of a candle up to 48 kilometers away.

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How animals can you see

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What do you think

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How many colors on this mosaic

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