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In the dark and chatty world of avatars and assumed identities, this cybercop is a virtual Sybil, trolling for creeps and thieves.

The killing of a young child led investigators to this problem: Can the single-celled life in water tell where the water is from?

Blood flies, and leaves a tale. But it takes an expert like Paulette Sutton to sort truth from fiction in spatter language.

Space-launched darts that strike like meteors

We asked a writer to notice and decode the science claims he heard on a typical day. they averaged one every 10 minutes. And they weren’t very scientific.

999 Dollars for Knowing Where to Bang

With the flood of in-car GPS navigation systems available today, you'll never have to ask for directions again.

Bogus science and health claims are rampant--and these self-styled vigilantes are after the perps.

It's a moment fraught with exquisite anticipation and dread–the moment when your car's true power is laid bare for all to see.

Last July, 9-year-old Alex Everett received his first shot of synthetic human growth hormone--an injection he will get every night for eight years. Alex is not sick--he is short. Should we be treating stature as a medical condition?

Souped-up rovers should boost extraterrestrial research.

Don't let the old-fashioned lines of this beauty fool you: Half a million buys you a boat that's tech-packed and joystick-steered.

Needles that don't hurt.

How 2.0 wants you.

Space architect Constance Adams spent seven years at NASA. Here's her prescription for fixing the place.

With the rutan-designed globalflyer, these adventurers tackle "the first great aviation challenge of the new century." Technology: cutting-edge. Risks: gigantic.

Devices that harness brain or nerve impulses to help patients see, hear, move, and communicate are already available -- though for now they remain relatively primitive.

Why a 145-pound man can outeat a former defensive tackle nicknamed "the fridge."

Or: Why Flying Makes You Feel Like a Rat in a Lab Cage

Popular Science brings 7 visionaries together to predict the trajectory of aviation in its second century.