TIL tetraethyllead (TEL) - main component used to make gasoline "leaded" - was selected out of thousands compounds tested mainly for being the cheapest - just 1 part TEL in 1300 parts gasoline was fou
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TIL about sea silk, a rare golden fabric made from filaments secreted by pen shells. It's been around for millennia, and is still made at small scale by a few people in Sardinia.
