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Japanese hospitals are using near-infrared imaging to help diagnose psychiatric disorders. But critics are not sure the technique is ready for the clinic.
In the past two decades, the green-chemistry movement has helped industry become much cleaner. But mindsets change slowly, and the revolution still has a long way to go.
Researchers have spent 25 years exploring the remarkable properties of fullerenes, carbon nanotubes and graphene. But commercializing them is neither quick nor easy.