Everyone is probably familiar with the expression “monkey see ... definitely knows that she is looking at herself in the mirror. The question is, is she examining her mouth and teeth so that ...

It's second nature, thanks in part to brain cells called "mirror neurons ... One researcher who's looking into this is Daniel Glaser, a cognitive neuroscientist at University College London.

"The mirror test can index one aspect of self awareness," O'Donoghue told Live Science. "There's a tendency to look at self ...