The device learns information as would a child.
Externally applied sunscreen lotion is the only pharmaceutical product that can protect against UV rays.
The disease normally affects only six in a million people.
The president benefited from a breakthrough drug. New cancer drugs cost $200,000 for each additional year of life.
Researchers see the disease accelerate in mice that received antioxidants.
Cancer experts expressed hope after learning that former President Jimmy Carter's melanoma would be treated with Merck & Co's Keytruda drug.