Schizophrenics can tickle themselves

Schizophrenics are capable of tickling themselves because of their difficulties recognizing their own actions in advance. Tickling yourself is impossible in most people for the same reason that punching others seems half as forceful as it really is — your body offsets your own force. When you tickle yourself, your brain offsets that force and doesn’t respond the tickling.

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In ancient Mesoamerica, mirrors were fashioned from stone and were regarded as portals to a supernatural realm

The use of mirrors in Mesoamerican culture was associated with the idea that they served as portals to a realm that could be seen but not interacted with. Mirrors in pre-Columbian Mesoamerica were fashioned from stone and served a number of uses, from the decorative to the divinatory.

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