Who?: Former Olympic Gold medalist who was banned for allegedly taking performance enhancing drugs.
Christie was the sixth person to be voted off the show, after he found himself in the bottom two alongside comedian Dom Joly.
He's backed former X Factor contestant Stacey Solomon to win overall, saying: "She's the loveliest person."
Tools designed to ensure computer code in smart cars does not crash has been inspired by hungry penguins.
The rounded sleeping capsules send guests drifting into ocean before arriving on desert island by morning.
Sitting on the saddle activates the part of the brain responsible for learning, a study has claimed.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
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