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How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

8 cars we're most looking forward to driving in 2015

Now that 2014 is officially in the books, it's time to look ahead. And following our list of the cars we liked best last year, we're now setting our sights at the hot new metal that's coming our way in 2015. Some of these, we've already seen. And some are still set to debut during the 2015 auto show season. But these are the machines that keep us going – the things on the horizon that we're particularly stoked to drive, and drive hard. Jeep Renegade Not the Chevrolet Corvette Z06. Not the Ford Mustang GT350. Not the new John Cooper Works Mini. Nope, I'm looking forward to the adorable, trail-rated Jeep Renegade. And that's because I really, really, really like our long-term Jeep Cherokee Trailhawk. I do not, however, care too much for the Cherokee's looks, and I really don't like its $38,059 price tag. The Renegade Trailhawk, meanwhile, promises much of the same rough-and-tumble character as its big brother, but at what we expect will be a more reasonable price (I'm personally wagering on the baby Jeep's off-road model starting at no more than $23,000). With a 2.4-liter four-cylinder and a nine-speed automatic, it should also be a bit easier to fill than the V6-powered Cherokee. Also, I can't help but love the way the Renegade looks. It's like someone took a Wrangler, squished it by 50 percent and then handed it off to George Clinton for a healthy dose of funk. The interior, with its bright, expressive trims and color schemes should also be a really nice place to spend some time. I'll be attending the Renegade's launch later this month, so I'll have a much shorter wait than my colleagues. Here's hoping the baby Jeep lives up to my expectations. – Brandon Turkus Associate Editor Mazda MX-5 Miata Here's an uncomfortable truth: I'd rather spend a day driving a properly sorted Mazda MX-5 Miata of any generation on a winding road than I would nearly any other vehicle, regardless of power, price or prestige. It's not just that I prize top-down driving and enjoy the Miata's small size because it gives me more road to play with. I just find there's more motoring joy to be had with high-fidelity handling and an uncorrupted car-to-driver communication loop than I do with face-distorting power or grip – let alone valet-stand gravitas. But perhaps most of all, I love Miatas because they can deliver that level of feedback and driver reward at modest speeds that won't put the locals on edge or endanger lives – you can use more of the car more of the time.

GM adds 1,200 jobs at Detroit-Hamtramck plant

General Motors is making a big move at its Hamtramck, MI, factory, announcing it will add a second shift and hire over 1,200 workers within the next several months. It's expected that by early 2016, the factory will employ over 2,800 workers to build the Chevrolet Volt, Impala, Malibu, Cadillac ELR, and by early next year, the new CT6. According to GM Hamtramck spokesperson Courtney Zemke, 40 of the 1,200 positions are for salaried employees, while the remainder will be hourly positions. As for where these employees will go, positions are being made available across the factory, so GM isn't focusing on any particular area for its new hires. It's a similar story behind the hiring surge itself. GM said in its press release that the "second shift is necessary to meet forecasted market demand," a position Zemke reiterated. It's a matter of demand across the plant's portfolio, rather than any one particular product seriously outstripping supply. Naturally, the United Auto Workers is happy with the move. "The workforce at Detroit-Hamtramck is second to none," UAW Local 22 Shop Chairman Don LaForest said in the attached release. "We appreciate the opportunity to expand our UAW-GM family." Hiring is going on now, with the second shift slated to get underway in early 2016. GM's Detroit-Hamtramck Assembly to Add Second Shift and More Than 1,200 Jobs Plant will nearly double its workforce by early 2016 2015-10-22 DETROIT – General Motors is nearly doubling its workforce at Detroit-Hamtramck Assembly by adding a second shift and more than 1,200 hourly and salaried jobs. The addition of a second shift will increase the plant's workforce to approximately 2,800 people when hiring is completed. The second shift is necessary to meet forecasted market demand for the five cars produced at Detroit-Hamtramck. "This is the result of the award-winning vehicles Detroit-Hamtramck produces and the confidence GM has in our team to build world-class quality for our customers," said Plant Manager Gary West. Second shift hiring is underway, and the shift is scheduled to begin operations in early 2016. "The workforce at Detroit-Hamtramck is second to none," said UAW Local 22 Shop Chairman Don LaForest. "We appreciate the opportunity to expand our UAW-GM family." The 4.1 million-square-foot Detroit-Hamtramck Assembly opened in 1985. GM has invested $1 billion in the plant over the last six years, making it one of the company's most-agile manufacturing facilities in North America.