The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Wikipedia's[2] article on Dolly states it without hedging: "Dolly's existence was announced to the public on 22 February 1997." She had been born on 5 July 1996, so the birth and the announcement are seven months apart and this pin takes the announcement, the day the result became public.
Gives the announcement date, the birth date of 5 July 1996, the method (nuclear transfer from a mammary gland cell), the foundational work by John Gurdon cloning African clawed frogs in 1958, and Dolly's death in 2003 from a progressive lung disease not linked to her cloning.[1]
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