In this case, the addition of time travel theoretically enables the scientists to observe primitive humans in the past.

Data had picked it up from observing humans and often did it when he was processing information or as an interrogative expression.

OX had observed humans long enough to recognize a masked but distinct expression of fear on the King's face.

Orangutans also have used spears to fish, presumably after observing humans fishing in a similar manner.

I've been observing humans for many years now.

It was important to observe humans in their natural states of behavior.

Therefore the piggies must be crossing the fence somehow and observing humans from within the enclave.

Someday 1 will meet robots who have been observing other humans in a similar fashion.

That gave the ambimorphs their first opportunity to observe humans up close, and they proceeded cautiously.