Can you catch a heart attack? Or diabetes? Or even obesity? In this special medical edition of Cosmos Magazine, find out how bacteria and viruses may be behind many diseases, why immunology research needs an overhaul, what you can do about the allergy epidemic sweeping the Western world, and follow researchers as they track down the cancer genome. You will also discover why whales and dolphins beach, and how small variations in supernovae hold the key to the fate of the universe.