Laughter a Form of Exercise

Research shows laughter can produce the same health benefits as physical exercise. Volunteers watched 20 minutes of a funny movie or comedy stand-up and revealed that laughing lowered their blood pressure, altered their appetite hormones as moderate exercise would.

In the spirit of this study, this video should provide you with your daily workout's worth.

Hyena's Laugh When They're Serious

Research finds that hyenas laughter is used to send status cues to the group. Research also found that each hyena's laugh's voice establish a hyena's identity and age. Moreover, the dominant hyena's have a monotone laugh while subordinate hyenas are more erratic.

Too bad the calls didn't work with this lion.

Tickling Rats

Researchers chanced upon rats playing and noticed what appeared to be laughter. Using a frequency converter, scientists were able to bring the noises to a level audible to human ears. To test if the noise really was laughter, the rats were tickled. Sure enough, the rats generated the same sounds as before when playing amongst themselves.

In addition, the rats began to enjoy the researchers company and follow the hand if it had tickled them.

See the video.