Unseen dangers

The ultraviolet camera reveals that although someone can look blemish-free (left), the sun's rays are always at work and can cause premature aging and melanoma.

Cyclists spend an inordinate amount of time outdoors and in the crosshairs of the sun's potentially damaging ultraviolet rays. And while we all know we should wear sunscreen, some of us aren't as disciplined about it as others. A new video from artist and filmmaker Thomas Leaveritt that uses an ultraviolet light-detecting camera shows that even apparently healthy skin can be aging faster than we think.

Thomas Leveritt's explorations with an ultraviolet camera graphically shows how prolonged, unprotected exposure to sunlight can prematurely age skin.

Under Leaveritt's camera we also see the ability of sunscreen to block those damaging rays, underscoring how important its use is in preventing premature aging, melanoma and skin cancer.

Ray banned

In ultraviolet light, sunscreen looks almost like mud-a good thing since it blocks the sun's harmful rays.