Their intelligence level had been quadrupled at the very least.

A being above that intelligence level cannot be killed.

Now listen: in you is a memory of such an intelligence level.

"Yes, but what is it that the drug does, to change people's intelligence level?"

The overall intelligence level of the crew was quite impressive.

"Of course they're assuming we're all at the same intelligence level!"

Some children are born with innately higher or lower intelligence levels than others.

"They tell me you have a pretty high intelligence level."

That is, each person should have an intelligence level for each of the two systems.

Her intelligence level is hard to gauge by normal means.