The actor's weight has gone up and down the scales like a yo-yo over the years. But when he's measuring on the larger side, it has a habit of showing on his face - a fact only added to by a short crop!
Our verdict: Longer is better, but his stylish turn as the shorter-haired Danny Zuko in 'Grease' will forever remain in our hearts
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.