To hear a interesting fact a day you can follow me on twitter where I use the hashtag #InterestingScience. Click here to see more interesting science facts. 7up contained the mood-stabilising drug lithium citrate until 1950. 620 million years ago, a day was only 21.9 hours long. When the moon is directly overhead, you weigh slightly less. A jiffy was originally a unit of time which was equal to the time it takes light to travel one cm. Hyenas are more closely related to cats than dogs. The
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