The number of Americans serving in the military is a small slice of the U.S. population. Here, a graphical look at the makeup of the military and the sacrifices those troops have made. Copyright 2011 National Public Radio. To see more, visit http://www.npr.org/.
Nuclear power plants generate 14 percent of the world's electricity, but some countries are more dependent on this power source than others. France relies on nuclear for 75.2 percent of its electricity; the United States, about 20 percent.
"I grew up watching footage of Nile crocodiles flying out of the water, eating zebras and wildebeest. And the thought of getting in the water with one was completely incomprehensible to me — just impossible."