Munroe takes simple "how to" questions like how to fill a swimming pool or how to how to move a house, and supplies scientifically realistic but completely insane solutions. For example, fusion reactions create water, so could you fill a pool by setting off a hydrogen bomb? Could you strap four jet engines to a house and fly it to another location? Some questions are less commons place, such as how to build a lava moat around your house or how to slow the passage of time. My favorite piece was on how to generate electricity on Mars by attaching a tether to one of Mars' moons and have it drag a wind turbine through the Martian atmosphere at 530 meters per second.