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Laser tag
A tiny laser, made by optical gear companies like JDSU, projects infrared light that's invisible to the human eye. The light hits your body and bounces back through a filter, which discards any ambient light. An image sensor uses data from your reflection to ascertain the way you've moved your hand.


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Last updated March 22 2011: 11:17 AM ET
Like its predecessor, the iPad 2 wasn't built specifically for enterprise customers. But that doesn't mean you won't find tablets in the office. Or in the operating room. More
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A recent Supreme Court decision, confusing Copyright Office rules and Amazon's Kindle policies all indicate that the only way consumers will ever get to resell "used" ebooks may be to sell their hard drives, too. More
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