Did you know that eating chocolate can help your heart, that singing can give you a natural "high" and that having more houseplants can boost your productivity and brain power? Dr Michael Mosley unearths a range of Just One Things, whose impacts are so surprising and intriguing you will be desperate to try them out. He chats to experts, road tests all his tips and even enlists the help of some special guests to help you find that one small thing that could really make a difference to how you feel every day.