Template:Are You Sure/April 8
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• ... that physician and archaeologist Michele Mercati (8 April 1541 – 25 June 1593) was among the first scholars to recognize prehistoric stone tools as human-made rather than natural or mythologically created thunderstones?
• ... that physicist Heike Kamerlingh Onnes (21 September 1853 – 21 February 1926) discovered superconductivity in 1911, writing in his notebook on April 8: Kwik nagenoeg nul ("Mercury[’s resistance] practically zero [at 3 K].").
• ... that inventor, astronomer, mathematician, clockmaker, and surveyor David Rittenhouse (8 April 1732 – 26 June 1796) was the first Director of the United States Mint, and that Rittenhouse personally struck the new nation's first coins by hand?