We use energy in its various forms everyday. But what is it? This week, it’s back to basics. Bill and Corey teach us about the fundamentals of energy and answer caller questions including one from Renee from Kansas, who asks, "How much energy is being wasted when my kids leave the lights on?"You can listen to ad-free new episodes of Science Rules! only on Stitcher Premium. For a free month of Stitcher Premium, go to stitcherpremium.com and use promo code ‘SCIENCE.’