Engineers at the North Carolina State University claim to have developed a chip smaller than a human fingernail that can store 50 times more data than current DRAM memory chips of similar size, Wired reported on Tuesday. The prototype can theoretically hold 1TB, says Jagdish Narayan, a professor of materials science and engineering at the school. This was achieved by selectively doping the material, or adding impurities to change its data storage capacity. In this case, the researchers added nickel to magnesium oxide, mixing the metal and ceramic.