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A cloud typically has a volume of around 1km³ and a density of around 1.003kg per m³ – that's a density that’s around 0.4 per cent lower than the air surrounding it (this is how they are able to float).

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This is because most scientists define wetness as a liquid’s ability to maintain contact with a solid surface, meaning that water itself is not wet, but can make other objects wet.

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After Einstein’s death in 1955, his brain was removed during an autopsy without his family’s knowledge or consent. Dr. Thomas Harvey, a pathologist at the Princeton Hospital, was the one who performed the autopsy and kept the brain with the intention of studying it to discover what made Einstein a genius.

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They can hold their breath underwater for a full minute. Their large nostrils act as valves to keep water out as they dive up to six meters. When colder weather comes they feast on underwater plants that are out of reach for other species.

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On most maps, the Mercator projection first developed in 1569 – is still used. This method is wildly inaccurate and makes Alaska appear as large as Brazil and Greenland 14 times larger than it actually is. For a map to be completely accurate, it would need to be life-size and round, not flat.

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They instead breathe through spiracles, nine or ten tiny openings, depending on the species.

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Between 1,000 and 12,000 teeth, to be precise. They aren’t like ours, though, so don’t be thinking about snails with ridiculous toothy grins. You’ll find the snail's tiny 'teeth' all over its file-like tongue.

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You may have heard that an elephant never forgets, but scientists aren’t sure why. It’s thought that humans process memories during REM sleep. Elephants, on the other hand, have been observed to only go into REM sleep every three to four days, and they only sleep for about three hours.

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Elephants sleep less than any other animal.

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Elephants sleep less than any other animal.

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While still in high school, a student went 264.4 hours without sleep, for which he won first place in the 10th Annual Great San Diego Science Fair in 1964. When asked if he’d do it again, Randy gave a resounding “no.” Others claim to have beaten Randy’s record, but none of their attempts were done under strict observation, like Randy’s was, so there’s no way to know if they’re legitimate. Remember pulling all-nighters back in the day? Hopefully not. Make those a thing of the past if you still stay up from time to time completing projects; sleep deprivation can negatively impact your body and mind.

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The longest someone has gone without sleep is 11 days, 25 minutes.

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The longest someone has gone without sleep is 11 days, 25 minutes.

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Most people think of roses as flowers. But the rose family also contains fruits. In fact, apples, peaches, apricots, cherries, plums, strawberries and other berries are all part of the family. Maybe that’s why the aromas of these fruits are so sweet. Another fun fact is that rose petals are edible too.