Schizophrenia and Making People Smarter

The role of glutamate in mental illness, especially schizophrenia. More drugs, with the hope that there won't be side effects. When you're monkeying with the brain, I can't imagine not having side effects.

The most interesting part of the research, for me, was this throw away sentence:

Another glutamate drug, meanwhile, has been shown in preclinical studies to reverse mental retardation in adult rats, a finding that previously appeared impossible, Dr. Insel said.

Can you imagine the implications of reversing mental retardation? And, would a smart person be made smarter with a drug like this?