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Last week we had lab-grown burgers; this week it's powdered pizza. NASA's gotten in on the synthesized food action by awarding a $125,000 grant to Anjan Contractor, head of Systems & Materials Research Corporation, to develop a 3D food printer. The first device Contractor plans to build under the six-month grant is based on RepRap's open-source hardware and will be designed to print a pizza comprised of three layers of nutritional powders mixed with water and oil. As the final frontier gets further and further away, NASA's need for a nutritious, long-lasting food supply suitable for space travel grows. Since the powders used in Contractor's design -- potentially sourced from insects, grass and algae -- have a shelf life of about 30 years, his 3D food printer would be well-suited to the task. If your appetite's survived the idea of snacks made from pulverized insects, you can watch the grant-winning prototype print some synthesized chocolate after the break.

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Defense Distributed's plan is to put the power of guns in the hands of every person with access to the internet and a 3D printer. Until now, however, we'd only seen the Liberator pistol built using an expensive industrial-grade printer -- despite the fact that the blueprints for gun have been downloaded by thousands of people who don't have access to such a high-end machine. One of those folks decided to put the Liberator in the hands of the printing proletariat by making it with a consumer-level Lulzbot A0-101 3D printer, a nail and some common screws.

This new version, called the Lulz Liberator, differs from the original in that it's got a rifled barrel and uses metal hardware to hold it together (as opposed to printed plastic pins). Printing it took around two days and used about $25 worth of generic ABS material, and the pistol produced was fired successfully nine times, but its creator claims it could've shot more. It's still a far cry from a Glock or Beretta, of course, as the gun misfired several times, and removing spent shell casings required the use of a hammer. So, it's not quite ready for prime time, but it's one more bit of proof that the age of printed pistols is officially upon us.

[Image Credit: Michael Guslick]

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If you thought current media-darling Curiosity is where all the martian action is right now, think again. Its elder sibling, Opportunity, is still rolling up there too. In fact, it's just wheeled its way into a little page of NASA history: the longest distance one of its vehicles has traveled on a body beyond Earth. A recent short (by our standards) trip of 263 feet took its total to 22.22 miles covered on Mars' surface since landing in January 2004. The previous title holder was a Lunar Rover, part of the Apollo 17 mission over 40 years ago, that covered (if you hadn't guessed) 22.21 miles. Opportunity's not beat the world galaxy record though. That honor goes to the Soviet Lunokhod rover, which totted up a total of 23 lunar-based miles back in 1973. In relative terms, Curiosity's barely stretched its legs.

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Remember CASIS, the folks in charge of granting the public access to the national lab onboard the International Space Station, who were looking for the next great research project to send into space? Well, CASIS is still in the process of choosing the most deserving from among our reader submissions, but in the meantime, it's looking to give away a pair of the mission patches -- signed by their creator, famed designer Shepard Fairey -- from the inaugural orbital experiment scheduled to arrive on the ISS this fall. To enter for a chance to win one of these exclusive bits of space history, you need only venture beyond the break to read the rules of engagement and fill out the entry form. Best of luck folks, may the force of Fairey be with you.

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Amidst increasing concern about cybersecurity, researchers at North Carolina State University have taken one step closer to guarding America's infrastructure from Cylon attack. Well, almost. Dr. Mo-Yuen Chow and Ph.D candidate Wente Zeng have developed an algorithm that detects cyber attacks aimed at distributed network control systems (D-NCSs), which differ from their more vulnerable counterparts in that they don't rely on a centralized brain to coordinate the network's activities. Essentially, then, D-NCSs are nervous systems comprised of several mini-brains working together. In the event of a cyber attack, the algorithm isolates the infected brain before the contamination can spread across the network's pathways. This software solution will be a good first line of defense when vengeful A.I. inevitably rises up in revolt. In the words of Admiral William Adama, so say we all.

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See that package above? That phone-and-case combo could find a home in your hand, thanks to Otterbox. The company, which is well known for its durable cases, has an AT&T-branded Samsung Galaxy S 4 to hand out to one of our lucky readers! Additionally, the grand prize winner -- along with a runner-up -- will receive one Defender case (valued at $50) and one Commuter case (valued at $35) specifically designed for the GS4. The phone is locked and doesn't come with service, so those of you who aren't AT&T fans may need to get creative with it. Hit up the Rafflecopter widget below to enter, and good luck!

Note: Because the GS4 is locked to a US carrier, this week's giveaway is unfortunately limited to our US readers. We should have some Canadian and UK giveaways coming up in the near future, however, so stay tuned!

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Sure, your pet hamster's amazing leg strength may someday power a house, but can it beat you in a race? A pair of Chicago-based artists might be able to help you solve this mystery. The duo recently hooked up a homemade tachometer to a hamster's exercise wheel and mapped the data to a treadmill's motor. The fur ball's RPMs are transferred in real time, which gives it the ability to control its bipedal competitor's running speeds. The team cautions that no animals were harmed during this experiment, however a human ego may have been bruised after trying to keep up with a tireless rodent.

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The Smithsonian has been experimenting with 3D scanning for some time now, using tools like laser arm scanners to map models of whale fossils and other ancient artifacts. Now the museum is utilizing the technology to preserve its collection for posterity. Its "laser cowboys" Vince Rossi and Adam Metallo are working full-time to record items for future generations, as part of an extensive effort to digitize 14 million prioritized objects (a list that also includes artwork and lab specimen). After the break, check out a video of the team working to preserve a digital copy of the Philadelphia gunboat, America's oldest fighting vessel.

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Dr. Mark Post of the University of Maastricht has carefully cultivated the most expensive burger you will probably never eat. Using stem cells and the science of tissue engineering, Post and his team have developed a method for creating an edible product called in-Vitro meat, which they hope to present in burger form at a special event in London next month. Despite the burger's artificial origins, Post claims it "tastes reasonably good."

The in-Vitro burger was designed as a proof-of-concept to address the problem of a growing global population with a rapidly dwindling food supply. Even so, it's unlikely that lab-grown meat will be as widely available as White Castle anytime soon since creating it is an expensive, time-consuming process -- a single burger costs about $325,000 to produce. Each pricey patty begins its life as cells sourced from the necks of slaughterhouse cows, which are then developed in a growth serum comprised of fetal calf stem cells. After three weeks, those cells divide into a strip of meat, about half an inch long. Combine about 20,000 of those tissue strips and you've got yourself a burger. If that doesn't get your taste buds tingling, we don't know what will.

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