This video comes straight from NSTA (National Science Teaching Association) and gives a fun lesson on how you can teach the phases of the moon. NSTA has their own YouTube channel where you can find tons of different activities and demonstrations that are great visuals for students while learning. It's a great resource for teachers to use if you're struggling with a topic in your classroom. It helps to look at the lesson from a different perspective.
"This is governing organization that correlates 'computational thinking' (a computer science method of thinking) into the K-12 classrooms. I find this useful because skills that can be learned from decoding problems, situations is beneficial in virtually any education subject." -CSTA http://csta.acm.org/