PHOTOS: Go Inside the Human Body!

Revolutionary technology offers never-before-seen views of our bodies at work.

The Ultimate Machine: From Birth to Death

Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
Inside the Living Body
A close-up of an elderly person's eye. Our sight worsens as we age. The lenses become stiffer and change in color as a result of exposure to ultraviolet light. The sun also causes crystals to form in the lenses. Most people aren't aware of this gradual change — the brain compensates for it. (National Geographic Channel)
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