The other day, Calvin was goofing around with something he shouldn't have been, and ended up cutting his thumb. It was a pretty good cut, and bled quite a bit. We cleaned it up, put a cloth on to stop the bleeding, and then I got a bandaid. All of a sudden we remembered Caleb's forensic kit with the blood typing paraphanalia, and ran down to the basement to figure out Calvin's blood type. Looks like he is type O. I don't know what David's blood type is, but I am B+, so I guess Calvin didn't get my blood. This is something that we'll have to research now. :)
So, be forewarned: If you are ever visiting us and cut yourself, we'll be heading down to the basement to figure out your blood type.