The bands fourth album had no mention of their name on the cover, nor an album title just four mysterious symbols to represent each band member. The painting of the wood-bearing old man was, it is said, found by singer Robert Plant in a junk shop. For the cover it was nailed to a demolished house in Dudley.
Classic licks: Black Dog, Rock and Roll, Stairway to Heaven.Shop for this classic album on Amazon
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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