Diana Nyad managed to stand unaided as she arrived at Smathers Beach in Key West after swimming for almost 53 hours.
The 64-year-old has become the first person to complete the swim from Cuba to Florida without using a shark cage.
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Temperatures will feel a little milder compared to of late with highs reaching 14C (57F).
Dozens of common treatments to help with a range of ailments are apparently of little or no use.
The prime minister has offered Scotland, Wales and Northern Ireland a "direct line" to Brexit Secretary David Davis.