This is a video of a girl who can say any word backwards within a few seconds of hearing it. It’s pretty mind blowing how the human brain can learn such interesting, though in this case pointless, tricks when practiced from a young age. This may also be a form of ambidexterity, as apparently as few as 1 in 10 million people are able to speak backwards. So it would be interesting to see if she can repeat and entire sentence backwards.
I have a cousin who I caught up with at a family party one year when he was around 12 years old and he’d learned how to solve the rubik’s cube over a period of a few days by memorising the algorithms. You could mix the rubik’s cube up without him seeing and he’d be able to solve it in front of you within seconds…