Apparently the sum IQ of the planet Earth (that is, everybody's IQ added together) is believed to be a universal constant as the population is rising.
One report I read said the man was visiting the zoo by himself, and the first thing that popped into my head was "Oh, a ZooChatter".

Hix
One report I read said the man was visiting the zoo by himself, and the first thing that popped into my head was "Oh, a ZooChatter".
Hix