Why does the sound of nails scratching a chalkboard make me cringe?
The noise when someone scrapes their nails down a blackboard is unbearable - but is it because of the sound or the sensation?
Asked by: Joseph Hill, London
It has been hypothesised that it evokes the sound of babies crying, but it's really not so much the sound itself as the thought of scratching our own nails down a blackboard.
This is quite a painful thing to do because the vibrations are transmitted directly to the nail-bed and we may just be empathising with that sensation.
Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.