Horizon: Playing God

Series exploring topical scientific issues. Adam Rutherford meets a new creature created by American scientists - the spider-goat. It is part goat, part spider, and its milk can be used to create an artificial spider's web. It is part of a new field of research, synthetic biology, with a radical aim - to break down nature into spare parts so that we can rebuild it however we please. This technology is already being used to make bio-diesel to power cars. Other researchers are looking at how human emotions might be controlled by sending 'biological machines' into the brain. episode 7