The BBC News presenter ran 150 miles with about 1,000 other runners over the Sahara desert.
The women who spent years protecting Britain in secret underground bunkers.
A selection of some of the most striking sports photographs taken around the world this week.
An ancient juniper forest and its living fossils
Some of the best news photos from the past week
A photographic road trip through Cuba
Ami Vitale speaks about her photographic adventures and offers advice to those wanting to follow in her footsteps.
The simple string test you can do in seconds
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