You'd have to travel 100 miles (160 kilometers) an hour for two whole hours to get from one end to the other of a line of fortresses along the eastern border of France. And you'd have to pay two...
Water beneath your feet
All the earth's water isn't in seas, lakes, ponds, and rivers. A lot of it is beneath your feet---down in the ground. When rain falls, much of the water seeps down through the soil. It keeps going...