Question: Why does ever person in the world look different and animals all look the same? And why do our voices all sound different?

Jason King answered on 13 Mar 2013:

This is really just from your point of view. If you were a cat or a dog for example you would probably think that all other cats and dogs look different too. We’re kind of trained to look at human faces, to identify differences easily which is important for our social behaviour. It would be chaos if we couldn’t tell the difference between each other!