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Built more than 4500 years ago, you’d think there was nothing left to discover inside Cairo’s Great Pyramid of Giza. Think again. Scientists have recently discovered a new chamber deep in the heart of the tomb, all with the help of starlight.

You might not feel it, but it’s always raining – not raindrops, but cosmic rays. These high-energy particles from outer space could contain clues to some of the mysteries of the Universe.