hyperloop

Roman Mars gives a funny TED talk on vexillology, laying out five basic principles of good flag design and why many city flags fail them.

Copenhagen's bicycle ambassador Mikael Colville-Andersen argues in a TEDx talk that bicycle helmets threaten bicycle culture. He says they distract from road design and make cycling look dangerous.

A TEDxBangalore talk by The Ugly Indian, an anonymous collective, asking why Indians tolerate filthy public spaces. It describes their volunteer approach of quietly cleaning up spots and turning the tragedy of the commons into a victory.