Which unit of measurement is defined as the distance light travels in a vacuum in 1/299,792,458 of a second?
The definitions of our everyday units have quietly become bizarre. The humble metre, once a physical bar of platinum-iridium in Paris, is now tied to the speed of light itself.
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Which Roman emperor debased the silver denarius so severely that its silver content dropped to around 5% by the end of his reign in 217 AD?
π° Money Β· 26 votes
Which British engineer patented the first practical portland cement in 1824?
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Should big film franchises be forced to take a five-year break before rebooting?
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