I gave blood at my local bloodbank yesterday. It was a tiny prickle that yielded half a litre of blood. It turns out I’m B-positive, which is 8% of the population. As I looked at the sheet of percentages it hit me that people shouldn’t stay away from the blood-bank thinking that their bloodtype is common and therefore unnecessary: it just means the same percentage will need that particular bloodtype.
Have you ever given blood? Why? Why not?