In 1986, the first PC virus - Brain - began to spread. What was once annoying has become a sophisticated tool for crime. Computer security expert Mikko Hyppönen describes discovering Brain and why the guys who wrote it never meant any harm.
Mankind has driven species after species extinct. Now Stewart Brand says, we have the technology to bring back the species that we wiped out. So should we? Which ones? He asks a big question whose answer is closer than you may think.
Why can't two slices of pizza be used as a slide clicker? Why shouldn't you make music with ketchup? Inventor Jay Silver talks about the urge to play with the world around you and demos MaKey MaKey, a kit for hacking everyday objects.
Neurosurgeon Andres Lozano talks about dramatic findings in deep brain stimulation including a woman with Parkinson's who instantly stops shaking, and brain areas eroded by Alzheimer's that are brought back to life.