The "aha" moment: When Hank Green asked his wife to see Tron: Legacy in 3-D late last year, she refused, explaining that watching 3-D movies gave her a headache. Green, an Internet entrepreneur who runs several websites, including, persuaded her to join him, promising to find a solution later on. He went online and discovered that his wife was not alone.

R&D: That night, Green brought home the 3-D glasses he and his wife had worn to see Tron. He knew they worked by blocking a different movie image with each lens, creating the illusion of depth. Armed with a hot glue gun, he created a pair of glasses that blocked the same image in both lenses, reducing the film to 2-D. His wife wore them to see The Chronicles of Narnia: The Voyage of the Dawn Treader in 3-D, and they worked.

Hitting the market: Within a week, a handful of Green's friends had placed orders for the 2-D glasses. He found a Chinese manufacturer on to make a large batch. In January, he started selling them for $7.99 a pair on his website Since then, he has sold about 3,000 pairs.

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