In science, sometimes the best discoveries come when you’re exploring something else entirely. That’s the case with recent findings from the National Institute of Standards and Technology (NIST), where a research team has come up with a way to build safe, nontoxic gold wires onto flexible, thin plastic film. Their demonstration potentially clears the path for a host of wearable electronic devices that monitor health.   The finding might overcome a basic issue confronting medical engineers: How...