Veins
Here's an odd one I've just noticed... I've always had just the one visible side vein in the crook of my left elbow, which was forever being stabbed by evil nurses and phlebotomists.
Not only can I now see the right one, but the central (bigger) veins in both arms are visible! Blood donation and testing will be so much easier in future. 
Here's an odd one I've just noticed... I've always had just the one visible side vein in the crook of my left elbow, which was forever being stabbed by evil nurses and phlebotomists.