One of the runners-up for the biobricks lifeform category of our Mad Science Contest was Jonathan Cline, who described what he calls a "ketonalizer." This would be a bacteria-based system for analyzing the metabolic state of "ketosis" in a person's body — this is the state where the body starts burning fat and turning… » 9/15/08 12:02am 9/15/08 12:02am