Sport
90 million people watched a single tennis match
Billie Jean King beat Bobby Riggs in the 1973 Battle of the Sexes before 30,000 in the stadium and a global TV audience. She had already threatened a boycott to win equal prize money.
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Serena Williams won a Grand Slam while pregnant
She took the 2017 Australian Open without dropping a set, and only later revealed she had been about eight weeks pregnant throughout the tournament.
The scoreboard could not show a perfect 10
When Nadia Comaneci scored the first perfect ten in Olympic gymnastics in 1976, the display had only three digits and flashed 1.00. She was 14, and scored six more.
Four gymnastics moves are named after Simone Biles
A skill is named for the first gymnast to land it in competition. She has so many that judges have deliberately undervalued some to discourage others from attempting them.
She could not walk properly until she was 12
Wilma Rudolph had polio and wore a leg brace as a child. In 1960 she won three Olympic golds and was called the fastest woman in the world.
She won a world boxing title as a mother of two
Mary Kom took six world championships from a village in Manipur with no boxing tradition, returning to the ring after twins and winning again.