Heat Transfer
Heat transfers through our enviroment all the time. Anywhere you are, you are aware that things get warmer or get cooler. Like as when you dive into a swimming pool or walk barefoot on a sidewalk on a hot summer day. The heat transfer is always from the hotter object to the cooler object. Heat transfer can transfer to and through objects better than others.
Image found at: hyperphysics.phy-astr.gsu.edu