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TIL Lighthouses had different techniques for rotating the light, most being too slow, making the light less visible. Augustin Fresnel proposed a mercury flotation system in 1825. Despite some lenses weighing over 6,000 lbs. the design reduced friction, increased rotation, and ultimately saved lives.

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e0QX6 TIL alcohol based hand sanitizers can cause severe intoxication in small children when absorbed through the skin.
QJA6M TIL that Toshiba created the worlds smallest spinning platter hard drive (HDD) in 2004, at a size of just .85 inches (2.1 CM), which could hold 2 or 4 Gigabytes of data and was even used in phones and Apple iPods of the era.
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