Seven patients have received bladders grown from their own cells—that means no rejection, as in normal procedures. Forget organ-legging, organ farming is the future.
It turns out that dragline silk's molecular structure resists twisting. Having done a 400' free-fall rappel, I can assure you that we humans have not figured this one out yet—150' down from the roof of the cave, I was spinning like a dreidel and had to slow down and drop in controlled bursts.