two men, one in a red shirt, running towards a Frisbee.
Two men playing Frisbee
Two women throwing a javelin
a young pair go up some stairs together
A little boy watches a captured lizard.
The specification of study question shifted from the principle investigator to the persons who commissioned the study.
Clinton wanted to do great changes to Medicare.
We can learn how to defeat HIV in humans by studying it in chimps.
Two people are on opposite sides of a newspaper box and a shopping cart and one hands the other a white cup.