Some scientists feel that once humans entered the picture it changed a lot of things.

Certain areas are declared "safe" and humans can enter these areas without fear of attack.

It was not until several years later that humans entered the scene.

Then humans entered the story, not sent down from the heavens, but as just another creature.

The two humans got out and entered the radio-astronomy listening room.

Prehistoric humans entered what is now Montana more than 10,000 years ago.

We humans have entered a new era, she thought before she fell asleep.

Two looked up as the humans entered, and Gail caught her breath.

However, attacks are rare as few humans enter its oceanic habitat.

No human can enter or leave unguided, and none should wander about in it.