[Missed Miss]

But humans can’t make an entire new arm. “There must be something in humans that prevents the regenerative process from going that far,” Gardiner says.

Does it HAVE to be something in us that prevents it? Why can't it be something in us that we just haven't learned to tap into, yet?
Last year, some guy was working with one of those model planes that can actually fly and uses some kind of fuel (gas?) to power the propellers. While working on it, he accidentally had his finger(s) in the propeller when he started it up and it cut off that/those fingers! He was rushed to UPMC to have it taken care of and, while there, the doctor decided t try an experimental thing on him. Some kind of powder that is derived from stem cells, I think. The doctor put some of this powder on the guy's finger(s) and, within 4 weeks, the finger(s) grew completely back!!!! The doctor was asked if this will work with limbs, too, he said, No, but we're working on it.
Last night on Late Night, David Letterman was interviewing a military Sgt. who'd had all 4 limbs blown off of him via a bomb. His doctor was also on the show. The reason? The doctor transplanted someone else's donated arms on this guy and they WORK perfectly well!!!!
Dare I say, there IS hope?