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How the Eye Functions - Diagrams of structure of the human eye. How light waves are refracted by lens of eye & focused on the retina. The lens, its position & changes in curvature. Monocular & binocular vision, retina and function.

What does Pikachu have to do with your eyes? Find out in 10 things you didn't know about your eyes.

Music= Around the World by Terry Devine-King

Whether we cry during a sad movie, while chopping onions, or completely involuntarily, our eyes are constantly producing tears. Alex Gendler tracks a particularly watery day in the life of Iris (the iris) as she cycles through basal, reflex and emotional tears.

Pollination: it's vital to life on Earth but largely unseen by the human eye. Filmmaker Louie Schwartzberg shows us the intricate world of pollen and pollinators with gorgeous high-speed images from his film "Wings of Life," inspired by the vanishing of one of nature's primary pollinators, the honeybee.

Here at Popular Science, we love space-and we know you do too. From seeing the nearly-true colors of Europa, a molten metal orb levitate in microgravity, or even a map of a distant protoplanet, pictures of and from beyond Earth are often the best way to journey to the final frontier.
To that end, this is your (almost) daily dose of amazing space imagery. Bookmark this page to see a wide variety of space-related eye candy, including photographs our home planet taken from orbit, stunning scientific visualizations, and of course, amazing astronomy images.