Thought control

Israeli scientists have developed tiny robots that can release drugs in response to human thought. The DNA origami robots have tiny iron oxide nanoparticles. When put in a magnetic field, these particles act as a switch, open a DNA ‘‘gate’’ and expose a drug. The researchers attached a device that measures brain activity to a magnetic coil, which switched on with lots of brain activity. It is hoped that more sophisticated robots could one day offer highly targeted drugs for psychological conditions.