The Next Tech Billionaires

Image for The Next Tech BillionairesNot currently available on BBC iPlayer

Duration: 30 minutes

Alastair Leithead enters Silicon Valley where the smart money is in the start-ups that could shape lives for decades to come.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.

Added. Check out your playlist Dismiss