Ah feel yer pain (or not)

A quote:
Humans are programmed, quite literally, to feel each others' pain. The neural circuit in our brains that registers pain also fires when we see someone else getting hurt; it's why we automatically wince.

This empathy makes evolutionary sense - it teaches us to avoid potential dangers that our peers have helpfully pointed out to us. But it can be liability for people like doctors, who see pain on a daily basis and are sometimes forced to inflict it in order to help their patients.
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