In case you forgot to pick up some sparklers for the holiday weekend, don't despair. Ira Flatow and a team of backyard science experts explain how to (safely) make firecrackers, smoke bombs and even an Oreo-fueled rocket, all while learning some basic scientific principles.
Theodore Gray, author, Mad Science: Experiments You Can Do at Home But Probably Shouldn't, columnist, Popular Science, "Gray Matter," co-founder, Wolfram Research, Urbana, Ill.
Anne Helmenstine, chemistry guide, About.com, Myrtle Beach, S.C.
William Gurstelle, author, Absinthe and Flamethrowers: Projects and Ruminations on the Art of Living Dangerously, (Chicago Review Press, 2009)