The eponymous Bramley and McIntosh apples are both lucky accidents, and both of them have stories which stretch from the early 19th century into present day.
Research:

Percy Fawcett, Manuscript 512, and a Lost City in the Amazon, Pt. 1
34:05

SYMHC Classics: Swill Milk
39:22

Behind the Scenes Minis: Mary, Beulah, Baby Alive
33:26