Mental Floss

BIG QUESTIONS

Readers of a certain age might remember Hypercolor or Hypergrafix clothing, the color-changing T-shirts produced by Generra that were all the rage in the early '90s. Now that the '90s are back, it's a good time to finally figure out the science behind the

Matt Soniak
iStock/Liia Galimzianova

Grab a partner and look into his or her eye "“ or stare deeply into it, if appropriate "“ in a normally lit room. The quick and dirty version of how you're able to view each other is this: Light enters the eye through the cornea, the clear outer dome, and

Matt Soniak