David Tennant took on the role as the 10th incarnation of the Doctor, keeping viewers hooked for five action-packed years, and for many fans taking over as the best ever Time Lord.
But he felt his time to pass on the sonic screwdriver had come, and decided to stepped down in 2009, making his last appearance in the two-part Christmas special 'The End of Time'.
Fun fact: Tennant found out he was the new Doctor while rehearsing for the live TV broadcast of 'The Quatermass Experiment' (2005).
Head over heels with excitement, he nearly went... well, head over heels live on air, as he ran across the set!
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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