During the auditions, it seemed the pair were the best of friends, but when the pressures of the live shows arrived and the competition grew fiercer the pair were invovled in several bitter rows.
Kelly said Tulisa was making her life a "living hell" and a week after Tulisa branded one of Kelly's acts a bully, Kelly pulled out of the show for a week claiming illness.
Afterwards, the couple put on smiling faces for the cameras but according to reports, behind the scenes they barely spoke to each other.
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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