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  1. Rats Laugh, but Not Like Humans | Scientific American

  2. See What Happens When You Tickle a Rat | National Geographic

  3. Tickled rats reveal brain structure that controls laughter

  4. Rats Laugh if You Tickle Them, Study Says | TIME

  5. Tickling Rats Reveals a Brain Region Linked to Laughter and Play

  6. Eavesdrop on Ultrasonic Rat Giggles | Scientific American

  7. Rats have a 'laugh centre' in their brains that responds to tickling

  8. Watch these ticklish rats laugh and jump for joy - AAAS

  9. Tickled Pink: Why Scientists Want to Make Rats Laugh - Greater …

  10. Researchers tickle rats to identify part of the brain critical for ...

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