1.   Scientists believe human laughter has an evolutionary origin and is linked with monkeys who grin and display the same shoulder-shaking signs.

2.   As with any group behavior, though, laughter has its menacing streak.

3.   Laughter has always had the ability to be more telling than the deepest, longest conversation.

4.   Laughter also has the useful property of being contagious, he said.

5.   Laughter has an organic effect on you, our advisers say.

6.   LAUGHTER HAS MYRIAD BENEFITS By Natalie Angier.

7.   Oliphant, whose laughter has a merry edge of mayhem to it, thinks there is no way to be offensive in the depiction of Clinton.

8.   She tells New Scientist that too little laughter could have serious consequences for our mental, physical and social well-being.

9.   The cameraman clambered into the stands as Connors, on his end of the court, made some crack to the spectators, whose laughter had McEnroe seething.