There is nothing quite like exploring the strange wonders of Yellowstone National Park as a child. Having a solid guide like a father to explain the why and how of stinky hot springs, popping mud pots, erupting geysers and pools of blue with names like sky, turquoise and robin's egg is a time honored American experience open to people worldwide. Here, at Grand Prismatic Spring, Father shares some tidbit of wisdom with his questioning children as a summer evening sets in.