Duracell has a brilliant way of warming people waiting out in the cold for a bus to arrive. They turned a transit shelter into a giant battery that powered a set of warmth-providing heaters. The catch? You can't do this alone.

The positive and negative contacts of the battery had to be connected by hand, and those who were waiting for the bus had to hold hands and work together to complete the circuit. Extremely worth it if it means keeping warm. Check it out below: