When my brother and I were little we played a game that had no rules, no physical boundaries, no set time limit, and absolutely no purpose—just a lot of running. My mom just called it dogfoose because it sounded like a made-up word; much like the game itself. This is an image from Fizz, Bubble, & Flash, a great primer on the periodic table for future Einsteins—and kids like me.
An image from FIZZ, BUBBLE & FLASH; Element Explorations and Atom Adventures for Hands-On Science Fun. Anita Brandolini and Michael Kline