I give blood (it seems to flow all too well from me - but that's me: give, give, give!

)
But then my life was saved by a very patient doctor doing pioneering work who spent all night soon after my birth, pushing in blood through one wrist/syringe and removing through other wrist/syringe!
I got a mention in The Lancet, he was knighted (you'll be amazed to hear that it wasn't for saving my life!). The pioneering work? Rhesus babies! They died before - totally routine nowadays