Larry Niven. Protector. Human eats mutagenic yam. Among various changes, it greatly augments intelligence. The first thought of a Protector, just awakened fro

Larry Niven. Protector. Human eats mutagenic yam. Among various changes, it greatly augments intelligence. The first thought of a Protector, just awakened from his mutative trance, is, "Wow, I have been really really dumb".