The Queen's only daughter Anne married show-jumper and army officer Mark Phillips in 1973.
Thousands of spectators lined the streets to watch the grand procession in London on 14 November, but the marriage wasn't to last.
The couple divorced in 1992 and the Princess Royal remarried six months later, this time in a quiet ceremony to Commander Timothy Laurence.
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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