Object: Some string that easily twists and untwists, or a necklace or chain.

Good morning, boys and girls. How many of you hove ever played with a chain or a necklace like this and watched it get all twisted up, and then untwist itself? Oh, that’s good, a lot of you have done this. That means that you will understand what I am talking about in our little experiment. It is important that you watch the chain when it is unwinding, or otherwise it will wind right back up the other way. Now if you want your chain to be straight, then you must let it unwind to just a certain point and then make it stop.

Some people are like chains that get twisted or untwisted, and I want to tell you abou…