Here's a one- or two-day lesson on the three kinds of thermal transfer that affect our atmosphere. To really make the lesson "pop," I suggest you bring in a hot plate and fry pan to cook popcorn by conduction, a hot air popper to cook popcorn by convection, and a microwave to cook popcorn by radiation. Students can "clean up" the experimental mess at the end of the lesson (coffee filters make cheap, disposable bowls). Another teaching tip: Surprise your students with the quiz again about two weeks later to test their retention of the lesson! Have a bag of fresh-popped microwave popcorn ready at the beginning of class (so kids smell it as they enter). Grade the quiz in class and pass out popcorn to those with passing scores. For those who don't pass, tell them to review their lesson handouts (first 2 pages of lesson that they folded into their science journals). Tell them you'll give them the quiz again the next day (and have your popcorn ready). Note: You may have students who passed the quiz the previous day telling you they failed and need to retake the quiz, so they can have more popcorn... Not a bad problem, really!