It has got two spindly black legs attached to a backpack with long rectangular batteries on the shoulder blades and an armored computer in the small of its back. Amusingly, it has radiator fins instead of buttocks. The whole machine looks sort of like a human skeleton, because the legs and hips have joints that mimic the movement of human limbs.

In fact, when you strap your legs into its legs, you can walk, run, kneel, squat, dance, or whatever—the exoskeleton has a range of motion equal to that of a human being. You move, and it moves with you. But once on, it allows a regular geek to haul a 200-lb. backpack as if it weighed as much as a couple of physics textbooks.

Now we're talking.

Let me explain how I got here. In late 2007, a production company called me and asked if I'd like to host The Works, a show for the History Channel. My job, they said, would be to "explain, uh, how things work." During my cable TV stint, I raced lawn mowers in Florida, was shot at with a rifle while inside an armored car in Texas, and—best of all—I piloted an honest-to-God lower-body exoskeleton with the researchers at Berkeley Bionics in California.

And so, on an otherwise perfectly normal summer day, I dropped by a nondescript brick building where a group of former graduate students from the University of California at Berkeley were busy making last-minute tweaks to a dead-black titanium exoskeleton, and they invite me to try it on.

My first impression: The straps are too big. The HULC was built with military money and it is designed to fit army guys. And soldiers have big thighs, apparently. I yank the Velcro straps as tight as possible, then strap my shoes into its open-toed boots. I shrug on the backpack and clasp the chest strap. I am now wearing an exoskeleton. Turned off, the device is heavy; it's like wearing a scuba tank on dry land. But once the researchers switch it on, HULC stands up on its own—with me inside.

At this point, I'm still hanging from the ceiling, so I can't fall down. I can't feel any extra weight because the exoskeleton frame supports itself (about 30 lbs), as well as any attached backpacks. We turn on the treadmill and I cautiously bend my knee. Nothing happens. A half-second later, force sensors detect my leg pushing against the exoskeleton and the machine jerkily bends its knee. The delay is disconcerting; I can barely walk.

A couple minutes later, the treadmill is rolling and I'm humping along like Forrest Gump in his special shoes. Like a video game that breaks the human face down into just a few polygons, my new exo-walk consists of just a few gross movements. Knee lift, foot out, foot down. Repeat. It lacks the fluidity of my normal walk, but I don't fall. And oh yeah, every movement is accompanied by the loud whine of electric motors. Each step sounds like reeee (that's the motor) followed by ker-thump, as my foot touches down.

Reeee-ker-thump. Reeee-ker-thump. "Drop the gun," I say. "You are under arrest." (Yes, that's a Robocop joke, and it is hilariously funny.)

After the practice run, it's time to hit the hallway. I immediately notice that my gait is becoming more fluid. I can even balance on one leg. This is because the machine is learning to anticipate my every move. The HULC is no dumb brute. It is constantly sensing the force of my movements and forming a model of how I walk. It's getting to know me, exoskeleton-style.

The HULC is a finished product, along with a slew of other exoskeletons, such as the full-body Sarcos and the medically oriented Hal-5. But make no mistake, scientists have been trying to build robotically augmented limbs since well before Sigourney Weaver used a power lifter to kick alien butt.

Designs for wearable mechanical skeletons have been evolving since the 1960s, when General Electric foresaw using the Hardiman for heavy loading in factories. Sadly, the original designs were infeasibly power-hungry, requiring heavy batteries that pulverized the payload-to-system weight ratio. Even worse, the old designs didn't degrade gracefully, which is a nice way of saying that when the power failed, they would fall to the ground and rip your limbs off. Ouch.

But today, exoskeletons have become a reality and, according to the researchers, they don't suffer from the limb-ripping drawbacks of yesteryear.

Once my gait cycles a few times, HULC has formed a complete model. A researcher informs me that from this point onward, the exoskeleton can cycle through my walk all by itself. Yes, by itself. This means that I could fall asleep and it would keep walking, dragging my legs through the motions. Suddenly, I imagine a platoon of snoozing soldiers fast marching non-stop through dark jungles at an average speed of 7 mph, a fast jog.

That's creepy. Plus, I'm sweaty and exhausted; it's time to take off the exoskeleton.

A couple yanks on the Velcro straps and I'm out. But my legs feel dead, like I just spent an hour jumping on a trampoline. My helpful researcher lets me know that the goal of the exoskeleton is to minimize metabolic cost. Using your muscles costs oxygen, and the brain is stingy—it uses just enough oxygen to get the job done. Once your brain figures out that it needs less oxygen to move (thanks to the exoskeleton), it sends less oxygen. Without the exoskeleton, my brain isn't giving me enough juice to use my limbs normally, hence the weak legs. Luckily, it only takes a few minutes to go back to normal. Thank you, brain.

Despite the amazingness of it all, I have to say it felt clumsy and weird to lock my limbs into the machine's cold, robotic embrace. You won't catch me walking down any staircases in an exoskeleton. At least, not without a lot more practice.

Daniel H. Wilson is the author of several books, including How to Survive a Robot Uprising, Where's My Jetpack?, and Bro-Jitsu: The Martial Art of Sibling Smackdown. Wilson earned his PhD in Robotics from Carnegie Mellon University in Pittsburgh. His first novel, Robopocalypse, is forthcoming from Doubleday.

Video from The Works courtesy of The History Channel

This week, Gizmodo is exploring the enhanced human future in a segment we call This Cyborg Life. It's about what happens when we treat our body less as a sacred object and more as what it is: Nature's ultimate machine.

The target of the attack seems to have been the trove of social security numbers, around 97,000 of which were stolen. SSNs can be used to access bank accounts, open credit cards, and even have new driver's licenses printed. The original hacking took place a month ago, from around April 6th to the 9th, and the university was only able to make their students (and former students; the accessed files go back to 1999) aware of the infiltration on the 21st.

FBI and other police have been notified and are investigating the crime, but we're not aware of any leads. The break-in was only discovered thanks to a sort of "signature" left by one of the hackers, so they may be too sneaky to have left a trail that can be followed. Let's hope they're dumber than they appear. The school has set up a site (here) to update the public with more information as it comes in. [AP]

The MIT Technology Review says that they both pulled their inspiration from the mind grapes of a British student who hypothesized that making objects look like a flat conducting sheet would successfully render an object invisible.

The basic idea is that objects hide under the mirror bump, and tiny silicon nanopillars on the surface of the mirrors steer light away from the object, making it—and the object it's covering—look flat. Technology Review likens this to hiding something under thick carpet.

That means, unfortunately, that this isn't an invisibility cloak we can run around in. These concepts follow suit with the original concept in thinking that a stationary, conductive sheet would work much better for rendering things invisible. So we all can't start skipping out on our dinner bills quite yet.

Still, you can't overlook the importance of taking little steps towards creating an invisible man. Invisibility is cool, even if just a concept in a lab somewhere. [Invisibility Cloak One and Invisibility Cloak Two via MIT Tech Review via KurzweilAI]

In order to get the needed information, the project uses a Java program that participants can download onto their phone.Traffic is then calculated using an algorithm researchers have developed. The software is eventually expected to work on most GPS-enabled phones on GSM networks. The project will not require many users, but does require them to be spread out for better results. Mobile Millennium plans to post the data it receives on the Web, but users who have the Java software will be most up-to-date. Luckily, for all the privacy-seekers, the information culled will be kept anonymous. Because the software uses a lot of data, only users with unlimited data plans are advised to sign up because you certainly don't want to end up with a $218 trillion phone bill. [Mobile Millennium via IT World]