A gently lobbed baseball is easy to see. The same ball, however, can seem to vanish from the hand of a skilled pitcher, ...

Artists and scientists have been creating optical illusions for centuries. Here are 35 mind-bending examples that prove you ...

Discover the remarkable limits of human visual perception and the maximum distances our eyes can discern.

The humpback whale has the whale equivalent of nearsightedness, which puts it at risk of being snarled in fishing gear.

Can a simple pair of eyes on a poster really boost your generosity—or is it all hype? See what studies show so far.