A lengthy but information-packed paper on the nature of games and the use of play in education. I haven't read the whole thing yet, but it seems like there is a lot here. I got it from a neat organization called The Education Arcade, which I'll bookmark above.
Claymation video of synaptic plasticity. In simpler terms, synaptic plasticity is the rearranging of neurons that can signal onto one another in order to increase brain function and to help create successful long term potentiation of signals (memory!)