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TIL that the word "underdog" comes from the 19th century term for the losing dog in a dog fight

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5VYRk TIL A lab in Guangzhou, China breeds infertile mosquitoes in a lab and releases them to slow the spread of diseases like Zika and Malaria.
6EQ5Z TIL of Russia's "Dead Hand" (aka "Perimeter") automated nuclear defense system. If a large spike in radiation levels was picked up within Russian borders (indicating nuclear detonation), the system would target many different cities and launch nukes. It is believed to still be active.
ADbeB TIL that the country of Russia has more surface area than the continent of Antartica
aYaA TIL that Seinfeld re-runs are sped up relative to their original versions in order to accommodate more time for commercials.
4XDMJ TIL that the Police Service of Northern Ireland was almost given the acronym of NIPS