Madeleine Finlay and Ian Sample discuss three intriguing science stories from the week. From a hint at alien life on a distant planet to a clue in the search for answers over why colon cancer rates are rising in the under 50s, and news from scientists who claim to have found a colour no one has seen before. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>