The price of knowledge

Ever on a quest to develop Cameron's interest in science, I chose a book of experiments for him during my latest trip to the library. This afternoon was the perfect opportunity to crack it open. For our first grand scientific undertaking, we explored the density of liquids by layering corn syrup, colored water and vegetable oil in a glass. Then, we dropped objects into the glass to see how far they descended. We began with the book-suggested paper clip, but quickly moved on to more pressing questions. For instance, which is denser, a ball of play dough or a marshmallow? In his enthusiasm, Cameron grabbed a penny and dime from his piggy bank and dropped them in. He watched in fascination as they sunk to the bottom, then turned to me and solemnly intoned, "This experiment has been very expensive for me."