The A6 is capable of zipping from 0 to 60 mph in 4.5 seconds, and high-tech steering makes a big difference in handling. Image: Audi Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. Audi is having a big moment: two years ago, the German brand announced it would launch 20 brand-new or significantly new models. Twelve of those have already rolled out, with more coming soon. The automaker also unveiled the Concept C, an all-electric two-seat sports car that looks like a cross between a TT and an R8. Audi says the Concept C “previews a future production model” but with the EV market currently in flux it’s impossible to say what happens next.  Meanwhile, Audi took the wraps off the newest version of its compact luxury sedan, the A6. Now in its 9th generation, the A6 is powered by a 6-cylinder gas engine making 362 hp and 406 lb-ft of torque.…