Rule #3 - Engage the imagination or no learning ever takes place. Use the senses: have the children see, feel, experience....through the imagination. This leads to other learning and a desire to know more..... I used a large vinyal cutout of a dinosaur footprint (actual size) and then had children estimate how many people could stand on the footprint, etc. They competed in dinosaur roaring contests as we learned about vocal cords, sound waves, and wondered if dinos really were related to birds might they chirp really loud????