ExtremeTech: A crack team of nanoengineers and biologists have created a non-volatile memory device out of salmon DNA and silver nanoparticles.
The memory is write-once-read-many (WORM), just like an optical disc. Basically, the researchers created a thin polymer film containing salmon DNA and silver nanoparticles. The DNA molecules are arranged in a regular pattern. By shining UV light on the biopolymer, the silver nanoparticles cluster around the DNA. This process seems to be permanent and irreversible, and according to the researchers the data is stored indefinitely.