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TIL the Grateful Dead briefly toured with a PA system called the Wall Of Sound that consisted of six hundred and four speakers, channelling twenty-six thousand watts of power. It has been called “the greatest vessel for the amplification of sound in history”.

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5Y0M9 TIL that In Japan, people do not use their signature on documents, but use their personal stamps called “Hanko” or “Inkan”.
kvwW TIL that Canada and Mexico are more ethnically diverse than the United States
M7KOB TIL Tom Lehrer transferred the rights to his music and lyrics to the public domain and all are free for download
8l14 TIL Income tax in the UK was a temporary measure introduced to pay for the Napoleonic wars. It’s still a temporary tax, which will expire if not renewed by an act of parliament each year.
R7edQ TIL that a Texas state representative introduced a bill honouring Albert DeSalvo, widely thought to be the Boston Strangler, for his work in "population control." He wanted to prove that his colleagues passed legislation without due diligence. They passed the bill unanimously.