By Alexander Walter

Titled "On Cities," a new series of twenty masterclasses was released by the Norman Foster Foundation this week. Each half-hour video features a leading expert in the fields of architecture, urbanism, economics, and mobility, aiming to promote cross-disciplinary and trans-geographic exchange.

"While cities undoubtedly offer significant advantages in the realm of education, health care and social services, urbanization is widely regarded as one of the fundamental challenges for public health, social equity and environmental sustainability," states the Foundation's announcement.