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TIL The invention of the original silly string was accidental. Was originally intended as a spray-on instant cast for fractures.

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pXV4 TIL there is one double barrel cannon in existence. It was intended to fire simultaneously from side-by-side barrels two balls linked by a chain, intended to scythe down enemy soldiers like standing wheat.
MY1m TIL modern Microsoft Office documents (.docx, .xlsx) are actually just ZIP files containing multiple XML files. You can change the extension of office documents to .zip and see this yourself.
l86V TIL The human body is made up of about 100 trillion cells, and by a remarkable numerical coincidence that is the same number of atoms in a human cell.
mxBXP TIL of the Plain Writing Act (2010), which states all US legislation must be written in clear, concise, and simple writing that everyday folk can understand
WklNL TIL that Darren Aronofsky's Black Swan and The Wrestler were originally supposed to be one movie about an affair between an obsessed ballet dancer and a burnt out wrestler. He eventually realized it was way too much story and split them, doing The Wrestler about 10 years later