They are not the fastest of swimmers but rather the oldest. Their youngest member: 87. Four men have smashed an elusive swimming record in Sydney and completed the four by 50 metre relay.
As rising temperatures threaten the survival of many plants and animals, one option could be to move them to more suitable climes. It's a divisive idea among scientists and conservationists.
On day 8 of the Olympics, Mo Farah defended his 10,000m crown with a stunning run, Monica Puig beat Angelique Kerber in the women's tennis final and Michael Phelps won his 23rd - and last - Olympic gold.
On day six in Rio, Fiji's rugby sevens team etched themselves into the history books, gymnastics star Simone Biles clinched her second gold and Michael Phelps reached 22 gold medals.
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