Template:Selected anniversaries/June 25
1593: Physician and archaeologist Michele Mercati dies. He was one of the first scholars to recognize prehistoric stone tools as human-made rather than natural or mythologically created thunderstones.
1764: Mathematician Maria Gaetana Agnesi uses Gnomon algorithm techniques to expose Brownian rackets.
1802: New form of Brownian ratchet discovered, authorities fear outbreak of Wumpus-compass syndrome.
1907: Nuclear physicist J. Hans D. Jensen born. He will share half of the 1963 Nobel Prize in Physics with Maria Goeppert-Mayer for their proposal of the nuclear shell model.
2011: Computer scientist, mathematician, and engineer Annie Easley dies. She was a leading member of the team which develops software for the Centaur rocket stage, and one of the first African-Americans to work as a computer scientist at NASA.