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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.

Weekly Recap: Revisting the BBC report that ended Jeremy Clarkson's Top Gear run

Jeremy Clarkson's long run as a Top Gear host has come to an end, and the reason is clear: His physical assault on one of the show's producers crossed a line, and the government-owned BBC couldn't tolerate it. The incident between Clarkson and Top Gear producer Oisin Tymon was initially described as a "fracas," and Clarkson was suspended. But his popularity and widespread support – even British Prime Minister David Cameron weighed in – suggested that the controversial Clarkson might be given yet another chance. The BBC put this to rest Wednesday when it sacked Clarkson and revealed the findings of its investigation. The report spelled out how Clarkson struck Tymon on the patio of a North Yorkshire (UK) hotel, leaving him with a bloodied, swollen lip. It was severe enough that the producer sought medical treatment. During and after the attack, Clarkson shouted expletives at Tymon and threatened to fire him. The noise carried into the hotel's dining room and even to a bedroom. Local police investigated the incident, but Tymon isn't pressing charges. The huge audience numbers, Clarkson's popularity and the high-octane excitement of Top Gear all melted away in the eyes of BBC director-general Tony Hall, who saw an attacker and a victim. "For me a line has been crossed," he said in a statement. "There cannot be one rule for one and one rule for another dictated by either rank, or public relations and commercial considerations." In that moment, Clarkson was the bad guy, though he was actually the one who reported it to the network and made repeated attempts to apologize to Tymon. He's also urged the media to leave the producer alone. Hall voiced regret in the statement that announced Clarkson's contract would not be renewed, but the BBC decided to move on. Rumors are swirling about possible replacements for Clarkson. The network says it wants to continue Top Gear in 2016 and is looking to air the rest of this season's episodes. Despite the controversy, the show has a global audience of 350 million viewers and is one of the BBC's most valuable properties. It's unclear what Clarkson's co-hosts, James May and Richard Hammond, will do, as their contracts were also reportedly up to be renewed. Other News & Notes 2016 Chevrolet Malibu hybrid charges up with Volt technology Chevrolet is taking some of the learnings and technologies from the 2016 Volt and dropping them into the reborn Malibu hybrid.

Chevy's low-cost pedestrian avoidance to debut on 2016 Malibu

The mainstreaming of safety technologies that began on luxury vehicles will get a big boost from General Motors later this year. The General says it plans to offer 22 driver assistance systems across its product portfolio of 2016 models, starting with the redesigned Chevrolet Malibu - the one that we know will keep tabs on teenagers for the benefit of parents. Pedestrian avoidance will be another of its available options. Instead of kitting the sedan out with numerous and expensive radar arrays, the GM system uses the camera mounted next to the rearview mirror that is already used for the lane-keeping function. New software lets it detect pedestrians, and when it detects a potential collision with one, it can alert the driver and brake autonomously if the driver doesn't react. Eventually, engineers want to give it the ability to do the same with cyclists. Because it uses existing hardware updated with new code, GM says the application costs "a few hundred dollars." GM demonstrated the Front Pedestrian Braking preventing a crash with a dummy pedestrian at speeds up to 15 miles per hour. Automotive News reports that it will reduce the severity of impact up to 40 miles per hour, but "may not be of much use in collisions at higher speeds." That feature will also join the options list of the Cadillac CT6. The press release below has more on GM's driver tech soon on the way. Related Video: GM Paving Way to Smarter and Safer Driving at All-New Active Safety Test Area 22 crash-avoidance technologies offered on 2016 Chevrolet, Buick, GMC and Cadillac models MILFORD, Mich. 2015-07-24 – Chevrolet, Buick, GMC and Cadillac will offer 22 different active safety technologies across their 2016 model year U.S. lineups, ranging from driver alerts to those that automatically intervene and assist the driver in critical situations. Safety engineers will develop and test these and other safety technologies for products around the world at GM's new, 52-acre Active Safety Test Area at its Milford Proving Ground near Detroit. The $14 million facility officially opened Friday. "Our comprehensive safety strategy of helping customers before, during and after a crash continues," said Jeff Boyer, vice president of GM Global Vehicle Safety.