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TIL one of Nirvana's most controversial performances was in 1993 at the Hollywood Rock Festival in São Paulo, after playing rough versions of their songs, they swapped instruments to play a set of badly rehearsed covers while they were booed by the audience and ended the show by demolishing the gear

l78bA TIL that to save on music licensing fees when the TV comedy WKRP was syndicated, not only were the licensed songs eliminated but they had to use "soundalike" voice actors to dub over the dialog where songs and actors were heard at the same time.
lwP7 TIL that in the UK, top lager companies remove and readd specific minerals to the water used in their brewing process - so that the taste of their beer is consistent. This is why locally brewed beers vary in taste depending on where you are in the country.
WkLx9 TIL, CBC had a contest to complete the phrase "as Canadian as ____" (by analogy with "as American as apple pie"). The winner: "as Canadian as possible, under the circumstances"
xGW0 TIL the median lethal dose (LD50) of marijuana is estimated (at the low end) at 1:20,000. This means a person would have to smoke around 15,000 pounds of marijuana in about 15 minutes to die from it.
nedPb TIL Bruce Lee could deliver a blow in 5/10 of a second from a distance of one meter (and 8/10 of a second from a meter and a half). It's 1/20 of the time it takes for a person to blink. At the time the standard cameras couldn't cope with the speed of Bruce's blows. His strikes were not visible.