I believe the reason another attack has not occurred is because we sent troops into Afghanistan, leading to the toppling of the Taliban-led government that protected Al Qaeda, the dismantling of terrorist bases and the capture or killing of many of its leaders. Once they had to run for the hills, it became much more difficult to carry out other attacks.

Buffalo Ridge is a plateau stretching 150 miles from Sisseton, S.D. to Storm Lake, Iowa. There, amid corn and soybean crops, some 670 wind turbines spin steady gusts of wind into energy. Over the course of a year an average of 1 billion kilowatt-hours can be generated, enough for 172,000 households.