The youngest person to break senior world record
On the 10th of August, 1965, Karen Muir became the youngest world record holder any time in any sport when she set a new world record in the women's 110-yard backstroke.
At 12 years, 10 months, and 25 days old, swimming in the junior section of the British Swimming Championships in Blackpool, England - because she was too young to compete with the older girls in the open category!
The girl from Kimberley in the Cape had only been swimming for three years, under the guidance of an imported British coach named Frank Gray.