Dr Aleks Krotoski gives the lowdown on how commerce has colonised the web.

Aleks examines social networks and asks how they're changing our relationships.

An award-winning portrait of Josh Harris, one of the internet's earliest visionaries and the man behind a bizarre psychological experiment that prefigured Big Brother.

Theoretical physicist and futurist Michio Kaku shows how, in the 21st century, artificial intelligence is going to become as ubiquitous as electricity, how robots with human-level intelligence may finally become a reality, and how we'll even be able to merge our minds with machine intelligence. As the challenges and choices are literally mind-bending, Dr Kaku asks how far we will ultimately go.