This Week in Engineering - Virgin Galactic’s first “feathered” flight; acoustic squirrel-detectors; physicists improve atomic clocks; a fabric that turns into concrete; a mummy with heart disease; and human-powered quadcopter.

Solar Purse - Now in 5 Electric Colors

Every Wednesday Dan and Vince review the engineering week that was.  From renewable energy to robotics, space exploration and civil engineering wonders, no engineering subject is safe from their jibes and jokes.