When you first tap on the lab dish holding a C. elegans worm - it will rapidly recoil from the tapping and swim backward to escape. Gradually - with continued tapping - it backs up less and less and finally stops backing up altogether.

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When you first tap on the lab dish holding a C. elegans worm - it will rapidly recoil from the tapping and swim backward to escape. Gradually - with continued tapping - it backs up less and less and finally stops backing up altogether.