He also observed changes in the house and around it.

After the starvation period ended, experts observed major changes in the men.

When I spoke with other researchers, they'd observed similar changes.

This is, however, easily overcome by simply rotating the sample and observing changes in the image.

He has not merely observed the events and changes he describes.

This allows a researcher to keep the voltage constant while observing changes in current.

The cooperation agreement was focused mostly on observing agricultural changes and pollution.

Sec became the active researcher, not observing changes, but demanding needed results.

It is wrong to suggest that humans have stopped evolving simply because we haven't observed changes during our history.