Sephy and Callum have been best friends since childhood, and now they are older and they realise they want more from each other.
But the harsh realities of lives lived in a segregated society are beginning to take their toll: Callum is a nought - a second-class citizen in a world dominated by the Crosses - and Sephy is a Cross, and the daughter of one of the most powerful men in the country.
The barriers they would have to cross to be together at first seem little more than minor obstacles to the two idealistic teenagers, but soon those barriers threaten not only their friendship but their lives.
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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