So go away if you don't wanna know anything.
In this movie, prior to going off on their own inter-dimensional journey, the Baxter Institute tests their "ship" on a chimpanzee.
And he comes back unharmed, which tells them that it's time to try with humans.
But seriously?!?! Have these movie-makers never read a Fantastic Four comic book?!?!
Because how can you expose a monkey (yes, I know, don't slow my roll here) to the same forces that created The Four...
This is the one case where I should have been allowed to write movies.