The ability to manipulate existing materials on a molecular level has already enabled advances in products like sunglasses, bike frames, and medical equipment. Scientists have greater control than ever over nanomaterials in a variety of substances, and their understanding is growing. Health concerns recently prompted Dunkin' Donuts to remove nanomaterials from their food. But certain advanced nanomaterials show promise for improving health, and even treating cancer. Coming soon: materials that are self-healing, self-cleaning, and that remember their original shape even if they’re bent.