Some things you can see directly, like your fingers. Other things, like your chin, you need a mirror or a camera to see.

Add Yahoo as a preferred source to see more of our stories on Google. Many philosophers and scientists have pondered if we live in a simulated universe, and University of Portsmouth scientist Melvin ...

Researchers at the University of British Columbia Okanagan have published a mathematical argument that, they say, rules out ...

Anyone who’s a fan of ‘The Matrix’ might wonder whether what we see is, in fact, reality. If you get an overwhelming feeling of déjà vu, don’t panic—an Agent will soon be with you.