Do you ever avoid giving blood or getting an IV because you're worried about being poked by a doctor or a nurse while they search for a vein? Now there’s a gadget to help; it’s known as a vein viewer.

Everyone who’s donated blood, gotten an intravenous (IV) line put in, or has taken a blood test knows that little bit of anxiety before the needle goes in. Will this be a one stick operation, or will ...