It's been over a year since Popular Mechanics published their list of "25 Skills Every Man Should Know." Now they've revised and expanded the list to "100 Skills Every Man Should Know." Consider it the ultimate list in DIY. The list is divided into sections: Automotive, Handling Emergencies, Home, Medical Myths, Military Know-How, Outdoors, Primitive Skills, Surviving Extremes, Teach Your Kids, Technology and Master Key Workshop Tools. And if you are interested in #34 on the list, "How to fell a tree," we've got a video that shows you how to do it.