The retina then sends these signals along the optic nerve (a cable of more than 1,000,000 nerve fibers) to the brain.After basketball practice, Ella looks forward to hanging out with her teammates and sharing a large pizza with extra cheese and a pitcher of soda — a well-deserved reward after hours of shooting free throws and running laps.Their world revolves around Instagram, the application adults mistook for an elevated photography service, and other apps decidedly less old-fashioned than Mark Zuckerberg's social network.And therein lies one of Facebook's biggest challenges: With more than 1 billion users worldwide and an unstated mission to make more money, Facebook has become a social network that's often too complicated, too risky, and, above all, too overrun by parents to give teens the type of digital freedom or release they crave.Classes are offered in Calvert County (Prince Frederick), Charles County (La Plata), and St. The human eye is like a camera that collects, focuses, and transmits light through a lens to create an image of its surroundings.But we know -- from observing teens, talking to parents and analysts, and from a few company statements -- that age doesn't become Facebook with this group.In recent weeks, Facebook has told us on two occasions about its teen-appeal problem.
When light enters the eye, the retina changes the light into nerve signals.Like a camera, the human eye controls the amount of light that enters the eye.The iris (the colored circular part of the eye) controls the amount of light passing through the pupil.It closes up the pupil in bright light and opens it wider in dim light.The cornea is the transparent, protective surface of the eye.
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For tweens and teens, Instagram -- and, more recently, Snap Chat, an app for sending photos and videos that appear and then disappear -- is the opposite of Facebook: simple, seemingly secret, and fun.