The Pantheon in Rome, Italy, was built thousands of years ago and looks like this today. Whoever heard of building a building with a big hole in the middle of the roof? No, the hole was not a...
Special problems—special classes
Akibo kneels on the sloping roof. Putting down his bundle of thatch, he makes sure it is in exactly the right place. Then he ties it down so that it will not slip off. The hot sun burns the back of...
Icy daggers
It's a bitterly cold winter day. Snow lies in a great white sheet on the ground and on the roof of your house. The roof is warm from the heat inside the house, so the snow on the roof is slowly...