1. A squirrel monkey, his body swathed in protective silicon rubber padding, is strapped into a capsule as part of a training exercise for spaceflight.

2. Squirrel monkey vocalization can be considered as a suitable model for the study in humans of the neurobiological basis of nonverbal emotional vocal utterances, such as laughing, crying, and groaning.

3. In one type of squirrel monkey, the males lack a visual pigment called L-opsin.

4. Evan found someone to fund his research on the mating habits of the squirrel monkey.

5. So the scientists got to wondering: what would happen if they gave a boy squirrel monkey the same opsin that girls have.

6. Even found someone to fund his research on the mating habits of the squirrel monkey.

7. Most of the females, on the other hand, see in full color. So the scientists got to wondering: what would happen if they gave a boy squirrel monkey the same opsin that girls have.