There’s a lot of hype around vitamin D. We’ve long known it’s essential for healthy bones, but over the last decade it’s been claimed low vitamin D levels are linked to a whole host of other illnesses. How clear are those links and how many of us really need vitamin D supplements? Get some rays Also known as the sunshine vitamin, there are two ways to get vitamin D. The first is the same way […]
You've suffered a gunshot wound. You're losing blood and your organs are failing fast. Would you let doctors drain your blood and chill your body to 10 ºC, entering a state of clinically-dead, suspended animation, to buy precious time that may save your life? This radical technique is being trailed by a group of doctors at the University of Pittsburgh Medical Center in Pennsylvania.
Thanks to a specialised group of cells called pacemaker cells, your heart keeps beating, and at a regular pace. There are a few thousand of these cells in your heart and they send out the electrical signals that initiate each heartbeat.