Adds reader cwmike: "The researchers formed 130 different synthetic DNA strands that can be used to compose logic circuits. From this source material, they created one 74-molecule, four-bit circuit that can compute the square root of any number up to 15 and round down the resulting answer to the nearest integer. In their setup, the multi-layered strands of DNA are fashioned (see video) into biochemical logic gates that can perform the basic Boolean AND, OR and NOR operations executed by today's transistor-based computer processors."
Sigmund Freud is alleged to have said that in the last analysis the entire field
of psychology may reduce to biological electrochemistry.