For nearly 130 years the definition of the kilogram has been tied to a lump of metal inside a Parisian vault that varies in mass from decade to decade
Tag: Science Lite
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What Happens If All the Oxygen Disappears for Five Seconds?
Catastrophic consequences can be felt in a couple of seconds
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What Exactly Is the Dark Side of the Moon?
You first need to understand why one side of the moon is forever pointed away from Earth