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TIL the name X-Ray came from its discoverer Wilhelm Röntgen while he investigated many properties of the new rays. He temporarily termed them "X-rays", using the mathematical designation ("X") for something unknown.

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4XdWa TIL an unmanned Russian spacecraft crashed on the moon on July 21, 1969 - while Neil Armstrong and Buzz Aldrin were still walking on the surface.
woZwE TIL Eddie Murphy mimics Bruce Lee to emote anger when he films movies. He first used the technique in 48 hours and says he copies Bruce Lee 'til this day.
mBxP TIL that the 1918 flu pandemic is often called the Spanish flu because Spain didn’t fake and minimise the data about the dead like Germany, Britain, France and the USA.
epdv4 TIL that a 'needs repair' US supercomputer with 8,000 Intel Xeon CPUs and 300TB of RAM was won via auction by a winning bid of $480,085.00.
vPB0x TIL that Canola is actually a contraction of "Canadian Oil, Low Acid"