From cave to skyscraper -- Building a tent -- What is a beam? -- What do we build structures with? -- Floor of your room -- Steel frame ... made out of paper -- Part of the building you don't see -- What tornadoes, earthquakes, and changes in temperature can do -- How to fight tornadoes and earthquakes -- Ropes and cables -- Sticks and stones -- Strings and sticks -- Shape and strength -- Barrels, dishes, butterflies, bicycle wheels, and eggs -- Balloons ... and back to the tent.