1.   Built to store ammunition, the caves here are similar to those in southern Afghanistan where Osama bin Laden and the Taliban leadership are believed to be hiding.

2.   But the human-powered devices being developed today are designed to use energy more efficiently and, most important, are built to store energy.

3.   Hundreds of warehouses have been built to store goods from the factories on the Mexican side of the border.

4.   Lagoons would be built to store the water, and canals and levees would be destroyed or rerouted to let it flow southward in a more natural way.