Ali was stripped of his world title and sent to jail for his refusal to fight in the Vietnam War. On his return, he was faced with the indestructible George Foreman and knocked him out in the eighth round.
But in 1978 his crown was taken again by Leon Spinks. But a rematch left no doubt as to who was 'The Greatest' and Ali regained his title.
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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