America is both by far the biggest donor to flood relief and the biggest source of other bilateral aid.

ECONOMIST: Banyan

Dams offer a renewable energy source, providing the means for irrigation, transportation and flood protection.

CNN: Study opens floodgates on dam removal

Though destructive, the flood of neutrons produced by a tokamak is (or, rather, should be) the source of its power.

ECONOMIST: How to get an energy rush without doughnuts