For ages, educators have been trying to convince kids that science can be fun, but The Health Museum is the only place we know of that lets them crawl through a 40-foot replica of the lower intestinal tract known as the “Colossal Colon.” Part of the museum’s permanent Amazing Body Gallery (where you can also walk inside a 10-foot brain), the model’s origins are actually rather heartwarming; the concept came from a colon cancer survivor in honor of a friend who died from the disease. So is this: Since opening in 1996, the museum has drawn more than 2.5 million visitors to its interactive exhibits, programming in the McGovern Theater, and a vast matrix of programs, camps, classes and seminars. The Amazing Body Store (read: gift shop), meanwhile, offers everything from a model kidney to, if a skeleton T-shirt isn’t your speed, some spiffy souvenir scrubs. For an additional fee, the on-site DeBakey Cell Lab allows guests to collect their own cheek samples, test anti-microbial agents, or learn how saliva breaks down food, among other microscope-ready dramas. Good, clean fun.