Horizon presenter Adam Rutherford looks at the advances in synthetic biology and genetic engineering that have resulted in, among other things, computer-made life forms and cancer assassin cells
Adam Rutherford, left, and Randy Lewis milk Freckles, the silk-producing goat. Photograph: BBC
Freckles looks like a perfectly normal kid. She has bright eyes, a healthy white pelt and gambols happily with Pudding, Sweetie and her five other siblings, exactly as you might imagine young goats do. Until I fend her off, she's very keen on chewing my trousers. To the casual observer, and to goatherds, she shows no signs that she is not a perfectly normal farmyard goat.