A helping hand is a short story that I came across in the 17th June issue of the Journal Nature. The story in short is that Josh who is writing his Ph.D thesis is being helped by another Josh in a parallel universe in return for sulphur and silicon which is what they need for their so called super improved technology. This story suggests that their are copies of all humans in all the parallel universes. I feel that this story is inconsistent in some respects.
First, it gives you the idea that there are multiple Joshes, one in each of the parallel universes and all exactly alike. Well, if one takes that to be true, it means that all these parallel universes too have to be exactly alike, which in turn means that the lumps which disintegrated from the rattlesnake were similar in all respects- size, mass, density, dynamics, intricate details, et. al. And, if that is indeed the case, how is it that the technology here is so inferior to that of the other parallel universes. So, in essence, all the lumps thrown off from the rattlesnake were not identical. And therefore, the existence of so many Joshes is inconceivable. And, even if there are so many Joshes, the Josh helping his namesake here is definitely intellectually superior to all his other copies, as he is doing all the persuading. That, in effect means that all the Joshes have not been created identically, and so, they are not copies of each other. Inconsistent again, in my opinion.
Also, even if they take away all the sulphur and silicon from this universe, it would still not be sufficient for all the other universes. And, if they think that this universe is not as technologically advanced as theirs, and they want to help this one in getting there, then this technologically inferior universe is also going to need these same elements at some point of time. This is a sure recipe for an inter-galactic war.
So, Josh (a.k.a AstralBoy from the parallel universe) to the Josh here being a helping hand...not so much, in my opinion.