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When my son was about 4 or 5 he used to draw pictures with pens in both hands simultaneously which I was always amazed he could do!
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When I was an infant I'd waddle through my mothers garden to my favourite fruit tree... a chilly bush. I'd pick the red chillies and eat them with gusto. My mouth would turn red but that didn't bother me. These were very hot chillies that my parents couldn't eat even when they were green.

Sadly, I lost that super power at some point. I love a spicy curry, but I don't think I'd make it through a Hot Ones episode as a guest.

Does your son still have his ability?

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And you can subvocalize (that is, think them in your mind) two different voices at once if you deliberately try to, and it's a skill that gets easier with practice. Though, no matter how much I practiced it, I was never able to get to where it would take place automatically without my forcing it.
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