It's impossible to talk about hoverboards without invoking a particular movie title, so we're not even going to try: Remember that awesome scene from Back to the Future Part II? It's one step closer to reality: A California startup just built a real, working hoverboard. Arx Pax is attempting to crowdfund the Hendo Hoverboard as a proof of concept for its hover engine technology -- it's not quite the floating skateboard Marty McFly rode through Hill Valley (and the Wild West), but it's an obvious precursor to the imagined ridable: a self-powered, levitating platform with enough power to lift a fully grown adult.

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Pretty soon, we may not even have to drive ourselves, but we'll still need to rely on the incredibly complex infrastructure of satellites and gadgets to get us from point A to point B. In this week's Rewind, we look at some highlights in the evolution of in-car navigation technology, from old-school cartography to today's digital tools.

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Disney's upcoming animated film Big Hero 6, about a boy and his soft robot (and a gang of super-powered friends), is perhaps the largest big-budget mash-up you'll ever see. Every aspect of the film's production represents a virtual collision of worlds. The story, something co-director Don Hall calls "one of the more obscure titles in the Marvel universe," has been completely re-imagined for parent company Disney. Then, there's the city of San Fransokyo it's set in -- an obvious marriage of two of the most tech-centric cities in the world. And, of course, there's the real-world technology that not only takes center stage as the basis for characters in the film, but also powered the onscreen visuals. It's undoubtedly a herculean effort from Walt Disney Animation Studios, and one that's likely to go unnoticed by audiences.

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Apple MacBook Air

Another Apple event has come and gone, and there's still no MacBook Air with a Retina display. I won't blame you if you're frustrated -- now that there's a 5K iMac, the Air is Cupertino's last screen-packing computer to ship without an extreme-resolution display. For that matter, competitors haven't had qualms about releasing their own ultraportable laptops with extra-crisp visuals. So, what gives? Is Apple holding back? The company may not be offering answers, but it's most likely that the technology needed to make a Retina-equipped Air simply isn't ready for prime time. As much as Apple would like the Air to hop on the high-res bandwagon, it may have to wait until a whole bunch of pieces fall into place. Read on to see what I mean.

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A new version of Apple's iMac desktop machine doesn't always come with a retooled exterior. As has become the norm with the MacBook Air and MacBook Pro, a spec boost via new internals is the case more often that not. This week, in addition to packing in a load of updated components, the company outfitted the all-in-one option with a new high-res Retina display that should translate to some stellar views. With a product line that dates back to the late '90s, let's take a closer look at the iMac's notable design changes over the years.

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Like it or not, people are after your data. Whether it's for advertising, national security or other nefarious purposes, you're leaving a trail of digital breadcrumbs for anyone to follow. But there's a growing arsenal of affordable tools to help protect your privacy both digitally and physically. In this week's Rewind, we take a look at this age of surveillance and some of the more approachable gadgets designed to help fight back against prying eyes.

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Each week our friends at Inhabitat recap the week's most interesting green developments and clean tech news for us -- it's the Week in Green.

We may take them for granted, but blue LEDs were difficult to develop -- it took 27 years to create the first one, and now they're in virtually every LED lightbulb on the market. Now the scientists who invented these energy-saving lights are finally getting their due: the 2014 Nobel Prize in physics. "Their inventions were revolutionary," wrote the Nobel Committee. "Incandescent light bulbs lit the 20th century; the 21st century will be lit by LED lamps."

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IRL: a tennis sensor you can use with any racquet

When I tested Babolat's Play Pure Drive connected tennis racquet, I found the resulting data insightful, but thought the platform was hampered by being tied to a single, albeit popular, model. Zepp's tennis sensor, though, can be swapped from racquet to racquet, so I thought I'd slap it on my current stick and see if it could quantify my averageness.

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Not everyone wants to be in the driver's seat when it comes to experiencing extreme action -- in fact, most people prefer to do it remotely. But with today's ultra-small wearable cameras and high-def resolutions, the less outdoorsy among us can experience a bit of the rush without any of the broken limbs. The action camera tech we now use is the product of decades of experimentation by fearless filmmakers and adrenaline junkies alike. Join us in the gallery below as we explore the emergence of the action camera from its clunky early days to today's go-anywhere POV devices.

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I had the full attention of Engadget's San Francisco office as I unpacked Epson's latest augmented reality headset, the Moverio BT-200. The glasses make for one heavy, awkward wearable: Coke-bottle thick lenses with inlaid transparent displays hovering in front of each eye. My coworkers and I passed them from desk to desk anyway, snapping goofy images for Instagram and musing over what to do with them. The glasses aren't Engadget's typical review fare -- it's not a product intended for consumers, and I wonder out loud how I'm going to explain the lenses to my readers. Without missing a beat, my editor Christopher Trout looks me square in the eye and gives me an answer. "Wear them," he says. "For a week. That's an assignment. You're doing it." Hoo boy.

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