A cackle and a giggle can mean different things. Scientists say there are two types of laughter: the kind that comes from pure glee, and the kind that's meant to send a social message. New research ...
PHILADELPHIA (CNN) --It's quiet in the house. Nobody else is home and the cat is fast asleep. Then you hear a disembodied woman's voice let out a short, mocking cackle. No, you're (probably) not being ...
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