With help from the opposite hand, my daughter's thumbs can be bent to touch the wrist. We found this out when she was 3 and I took her to an ortho because of her turned-down flat feet. Doctor took her thumb, bent it down and declared she had 'hyperextensive' joints, meaning the cartilidge was extra pliable and the joints loose. She's now 14, can still do the thumb thing and, as a dance student, can do some really painful looking splits. And her feet are still weird.
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Don't blame me. I didn't vote for either of'em.
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