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Scientists are claiming to have detected gravitational waves for the first time. It represents the last great confirmation of Albert Einstein's ideas, and opens the door to a completely new way to investigate the Universe. But many Radio 4 listeners still aren’t sure what they are. The presenter Paddy O’Connell asked for your definitions, newsreader Corrie Corfield read them and Professors Monica Grady and Jon Butterworth expertly reviewed them. (Image: Professor Monica Grady and Jon Butterworth)