MSNBC | Ha ha ha: Did that make you smile?Boy, I'm glad fifty years of canned laughter on situation comedies hasn't been utterly wasted. "Hi, honey, I'm home." Bwah-hah-hah.
If you see two people laughing at a joke you didn’t hear, chances are you will smile anyway — even if you don’t realize it.
According to a new study, laughter truly is contagious: the brain responds to the sound of laughter and preps the muscles in the face to join in the mirth.
Next on MSNBC: The sun rises... in the east!
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