Researchers at Harvard have designed, built and tested a flow battery that relies on a molecule found in plants called quinone. This battery doesn't require metal, making it a potentially much cheaper alternative to traditional batteries, and a possible answer to the energy storage problem posed by the rise of intermittent renewable sources like solar and wind. http://www.biologicaldiversity.org/news/center/articles/2014/earth-techling-01-15-2014.html Subscribe to The Daily Conversation null Facebook http://www.facebook.com/thedailyconversation Google+ https://plus.google.com/100134925804523235350/posts Twitter http://www.twitter.com/thedailyconvo