She is of a different race, but her species pheromones might excite certain humans.

These spirits were also considered to be derived from ancestors or certain deceased humans.

This property is expected to have much in common with what makes us describe certain humans as having common sense.

There are certain humans who should never be touched by the healing crystals.

There are even certain humans with a bent for the talent.

He'd read up on the connections between certain humans and vampires.

Somehow, by failing utterly, certain humans became even stronger.

"To get away from things, they jump" - a behavior that may be imitated by certain humans.

You give the impression that certain humans want to isolate humanity from us on principle.

Like Klingons, or certain humans at certain points in their development.