Live from London's Science Museum

Rory Cellan-Jones presents the 100th edition of Tech Tent, live from London's Science Museum, where he takes in the history of communications technology with curator John Liffen. We also discuss terrorism with our man in Silicon Valley Dave Lee, how tech is being used for good in developing countries, and how taking a selfie could replace passwords. With the BBC's Jane Wakefield and special guest Eileen Burbidge from Passion Capital.

(Photo: Eileen Burbidge and John Liffen with Rory Cellan-Jones at the Science Museum, Credit: BBC)