A one-time student protester came up with an idea for a simple vending machine that dispenses detergent in small amounts at bulk prices to help poor families in Chile.
Our Power Trip heads to Redwood City, California to talk to Joe Polastre, CTO and co-founder of Sentilla. The company has invented an unassuming rectangular box that tracks -- dollar by dollar -- how much energy the appliances in your home are using.