MindTest your brain on these mind-bending scientific riddles A bizarre Christmas dinner invitation, some mysterious carol singers and even a spot of charades. Can you solve all 12 of our unique festive riddles? Features
ChemistryWhy quasicrystals shouldn鈥檛 exist but are turning up in strange places Matter with 鈥渇orbidden鈥 symmetries was once thought to be confined to lab experiments, but is now being found in some of the world鈥檚 most extreme environments Features