instant

U.S. Open Instant Replay: Total Accuracy, Major Fun

The new Hawk-Eye Tennis Officiating System is bringing high drama and high tech to the tradition-bound tournament

For a closer look at how the Hawk-Eye works, launch the photo gallery by clicking 'View Photos' at left.

Its accuracy may be based on a complex computer-generated algorithm, but the Hawk-Eye Tennis Officiating System is ratcheting up the human drama at this year's U.S. Open. Rather than simply relying on officials to make line calls, the entire crowd now acts as referee, hollering "Challenge!" after controversial judgements.

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Big Brother 101

Could your social networks brand you an enemy of the state?

Instant Expert:

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December 2009: Best of What's New

In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.

Check out the best of what's new here.

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