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TIL printers embed tracking codes as hidden yellow dots on pages, revealing who printed what and when

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DQ9dY TIL light bulbs used to last longer over a hundred years ago!
W7EZX Today I learned: People in the 17th century actually believed in vampires
D1RpP TIL that in 1998, after analyzing the United States' real estate cycle, Georgist economist Fred Foldvary correctly predicted that there would be a recession-causing crash in the housing market in 2008.
M7jp8 TIL that Saint Patrick is the patron saint of not just Ireland but also of Nigeria, Boston, engineers, and paralegals.
QNGBd TIL stainless steel is not stain free but stains less than other alloys