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Is it worth upgrading to the Wireless headphones if you already own a pair of M-100s? That's a tough one. The new Crossfades are darn good Bluetooth headphones, and even better wired headphones. The updated signature has a little more bottom and there's obviously been some fine tuning work done to the mids. Though we'd say the Crossfade Wireless headphones are definitely worth the money, if you like the sound of the M-100s (and why wouldn't you?) and simply don't have the cash to spare for the Wireless cans, maybe something like BTunes can help.

Are you an energy genius? It’s hard to tell whether or not Americans are really aware of the energy that controls our lives and our future. The following energy quiz should be revealing. The answers are given at the end.Seven to eleven correct answers out of the twenty questions is a good passing grade. Twelve to fifteen right answers means you’re pretty energy-literate. Sixteen to nineteen correct answers means you should be advising Congress. Twenty right answers suggests you’re Mr. Spock reincarnated.

1) Which is the single piece of legislation in history that has saved the most lives?

a. The Highway Safety Act b. The Clean Air Act c. Newborn Screening Saves Lives Act d. The Clean Water Act

2) Advanced home battery systems coupled with rooftop solar will…

a. lower energy costs b. allow a home to decouple from the grid c. both

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3) Which global agreement has lowered greenhouse gas emissions the most?Despite all the nip-tucking this machine has seen, you'll still find a set of full-size ports along the sides including two USB 3.0, one USB 2.0, HDMI, USB-C and a SD card slot. What's more, there's Intel Core I power bubbling under the hood with the choice of either an i5 or i7 processor. 8GB of RAM comes standard, leaving users with picking between 256GB or 512GB for their storage options.

However, there are still a few details being left in the dark as LG has been mum on expected battery life. The South Korean electronics firm has also yet to release the all too crucial pricing details and announced a wide availability window of sometime in mid-2016.

The LG Gram 15 is without a doubt the lightest 15-inch laptop in the world, but I'm concerned it may have sacrificed too much in the process of fulfilling this bullet point. The flimsy screen is inadmissible by today's build quality standards and missing battery life claim isn't comforting either.

a. The 2015 COP21 Paris Climate Change Conference b. The 1997 Kyoto Protocol c. The 1994 U.N. Framework Convention on Climate Change d. The 1990 Montreal Protocol

With fast performance and a great keyboard, Acer's Chromebook R 11 looks like an enticing travel companion for budget-minded workers. And unlike standard Chromebooks, this one sports a versatile folding hinge that lets you use the machine like a big tablet. Unfortunately, short battery life limits the Chromebook R 11's potential for on-the-go-productivity.

The highlight of this machine has to be its excellent keyboard, which offers much deeper keys than we've come to expect on an 11.6-inch ultraportable laptop. With generous key travel and good feedback on each keystroke, the Chromebook R 11 feels great to type on, which is nice for marathon work sessions.

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The laptop's folding design is genuinely useful, letting you use the device like a tablet or fold it back partway to prop up the 11.6-inch touch display. That versatility could come in handy for using touch-screen apps in cramped quarters, such as on an airplane tray table. Other highlights include its 2.7-lb. lightweight design and an Intel Celeron N3150 processor with 4GB of RAM, which provides solid performance for daily work tasks. Relatively short battery life is one of the R 11's weak points. It ran for 7 hours and 28 minutes, which isn't exactly bad, but it does trail the ultraportable average of 8 hours and 20 minutes, as well as the runtimes of rival Chromebooks. The R 11 still has enough juice to last through most work flights, though.

Like all Chromebooks, this one runs on Chrome OS, a lightweight operating system designed by Google. Chrome OS isn't compatible with Mac or Windows software, instead focusing on Web apps. Thankfully, plenty of great Web-based software is available these days, including full-featured online versions of Microsoft's Word, Excel and PowerPoint apps.

Check back for a full review of the Acer Chromebook R 11 very soon, or check out our list of the best work laptops currently available. "Back to the Future Part II" got it partly right. In the year 2015, the hoverboard is a real form of transportation that lets trendy kids get into trouble while effortlessly zipping along the sidewalk. There are a handful of important differences, though. These self-balancing scooters don't actually hover like the ones in the movie.

Hoverboards have become one of the hottest news stories this holiday season -- and not just because they're selling like mad. According to the US Consumer Product Safety Commission, there have now been 12 incidents in the United States where the lithium ion batteries in these hoverboards reportedly caught fire -- destroying bedrooms and even entire homes.

The fires have started in all sorts of different circumstances, too. According to owners and witnesses, some of the hoverboards exploded while charging, others while riding and one while it was simply sitting near a kiosk in a Washington shopping mall. (There have been several other hoverboard fires reported in the UK, and at least one in Hong Kong.)

Here's the really scary part: there's no single reason why these hoverboards are exploding, and there's no sure-fire way to avoid potential catastrophe if you want to buy one yourself. There's no particular brand of hoverboard to avoid -- they all seem to come from thousands of interchangeable factories in China -- or any label on the box that guarantees a product won't explode. And much of the advice we've seen issued by local fire departments and government agencies isn't likely to help.

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For instance, officials have been warning that you should only use the charger that comes in the box. That sounds like common sense -- until you realize that these hoverboards tend to use a plug you won't find on any other type of device. Meaning you don't really choose which type of charger you can use, so it's pretty unlikely that any of these fires occurred due to someone mistaking a laptop charger for a hoverboard one.

Similarly, many officials now warn against overcharging hoverboards -- but when was the last time you had to think about overcharging a gadget? With modern laptops and smartphones, you simply plug them in and leave them there, trusting that they'll automatically shut off the flow of electricity when they're done.

While the US Consumer Product Safety Commission is now working nonstop to figure out the actual root causes of these incidents, they don't have the answers yet. "We want to be able to deliver for the public, but we hope they'll be able to appreciate that what's going on right now is a very thorough science-based investigation," said CPSC spokesman Scott Wolfson.

Or it could be that the CPSC pushes to ban hoverboards altogether. It wouldn't be the first time a popular toy was deemed too unsafe to sell. There are good reasons that lawn darts and magnetic Buckyballs, both popular toys, were banned. (Fires aren't the only reason that hoverboards are dangerous. The CPSC has received "dozens" of reports of injuries from falls from US hospital emergency rooms.)