Vision is arguably the most important of the five senses, but exactly how did we come by this amazing ability?  Find out with this engaging video on the 500 million year evolution of the human eye.

Two scientific concepts can be taught with this activity. First, the mixing of primary colors is demonstrated. As the color wheel spins, red, yellow, and blue are no longer visible; secondary colors orange, purple, and green appear in...

See how NBA player Corey Maggette monitors and processes movement out of the corner of his eye, and find out how this affects his reaction time in his sport. [4:57]