Scientists in Brazil have engineered a cow to produce human insulin in its milk, making history as the world’s first transgenic cow capable of such a feat. Though still a long way off, the researchers hope that this bovine breakthrough could open doors for sustainable insulin production and help tackle the world's insulin supply problems. For now, the achievement is just a proof-of-concept – but with additional testing and Food and Drug Administration (FDA) approval, it could be scaled up to rival current insulin production methods, which involve genetically modified yeast and bacteria. "Mother Nature designed the mammary gland as...