A waterless, edible toothpaste created by a businessman for his critically ill father was sent to the International Space Station (ISS) this month, fulfilling a long-held dream of the inventor.

Researchers from the Politecnico di Milano (Italy) and the University of Novi Sad (Serbia) have created an edible semiconductor using copper (II) phthalocyanine (CuPc), a substance found in toothpaste ...