We'd scoff if you told us about one of the Acer Predator 21 X's crazy features. A curved display? On a laptop? Twin GTX 1080 graphics cards? And, a tiny window through which you can peer in to see the processor's cooling fan spinning around? Yeah, pull the other one.As it happens, the Predator 21 X is very real, and it's a marvel to look at. It requires...