You know, now that I think about it, McCoy injecting the blood into a DEAD tribble makes no fucking sense. Why wouldn't he use just an injured tribble, if he wanted to study the blood's healing effects? Unless tribble biology is completely backwards, that blood isn't pumping through a dead animal.
The blood itself having healing properties is dumb, yeah, but it didn't bug me. But the way that Bones discovers it is actually super dumb.
...
Okay, FINE, this movie was dumb as hell all around. Still fun though. Not conceding that point. I'll almost certainly watch it again. The emotional beats work and the action is great. I wasn't asking for anything more. It wasn't all serious about itself and its themes like Prometheus, so I really can't hate it. Still, good thing that none of these writers are working on Star Wars VII. Abrams is a talented director who can turn out great product if he's got decent material to work with.
"The Doctor is Submarining through our brains." --Teague