Biological engineers have created a programming language that allows them to rapidly design complex, DNA-encoded circuits that give new functions to living cells.

Suppose we do the following: Let A = MOVE LEFT 1 UNIT; Let C = MOVE DOWN 1 UNIT; Let G = MOVE RIGHT 1 UNIT; Let T = MOVE UP 1 UNIT; Then we can map any genome into a random walk, a kind of Etch A S…