I think I made a post about this in random thoughts but thought it might make a good thread. About a month ago we had my sister and her family visiting. At that time I presented a challenge to the kids - ages ~ 10, 12, and 13 - that they seem to have taken to heart. I gave them my first book on Relativity, Einstein's Relativity: The Special and the General Theory--A Clear Explanation that Anyone Can Understand. I then offered $50 to the one who could read and understand this book at the youngest age. Their grandfather on their father's side is a retired nuclear engineer [Ph.D., MIT]. You can imagine his surprise and excitement when, this weekend, his ten-year-old grand-daughter asked him to summarize the Theory of Relativity for her! Using money to bribe kids to learn? Not something that I would generally approve of, but I know there is no way they would ever take on something that challenging without unique motivation. By making it a contest between the siblings, with a prize, and a chance for the youngest to win, it presented a unique opportunity to open little minds. No doubt that for many of us, our first exposure to Relativity was a life-changing experience. So this seemed like a pretty good deal for $50. I couldn't be more thrilled that over a month later, they're thinking about it.