How a race can change in a mere three weeks.

The human race didn't change just because they had acquired Heechee technology.

"You can say this race hasn't changed in eight months."

During the first half of the 19th century, one's race could change simply by stepping over state lines.

The race for No. 1 could change hands several times this season.

With 30 to go, however, the entire race would change.

He wondered if an entire race of beings could change their culture at such a fundamental level.

In 2011, the race changed its conditions to allow entry of older horses.

Your race has changed little in a million years.

The race has changed in that it is no longer just the local gentry who take part.