On this week’s Tech Nation, from the bumpy history of the chariot to how smartphones are essential equipment for transportation in the future. Economist deputy editor Tom Standage talks about “A Brief History of Motion: From the Wheel, to the Car, to What Comes Next”. Then Dr. Jim Brown, the CEO of DURECT, describes their first Phase 2 clinical trials for Alcoholic Hepatitis, known as AH. And a look at what comes next for their approach to regenerative medicine.