And there is more to learn. Jonathan Rottenberg says the science of crying is still in its infancy.

VOA: special.2009.01.28

The country night was warm and still except for a baby crying in the distance.

VOA: special.2009.06.27

Psychologist Jonathan Rottenberg at the University of South Florida says they wanted to study crying as it happens in everyday life, not in a laboratory.

VOA: special.2009.01.28

The old man sat up in bed, crying out "Who's there?"

VOA: special.2009.05.16

Billy crying out,then falling with his face in the dirt.

VOA: special.2009.12.12

Athnaise sat in her room crying.

VOA: special.2009.06.27

He was granted more than 600 patents. His ideas for processes or devices are used in bar-code scanners, automated warehouse manufacturing systems,fax and automated teller machines, the crying baby doll, and Sony Walkman portable cassette player.

VOA: standard.2009.12.18