The law that protects endangered species turns 40 tomorrow and perhaps the most controversial thing the government has done under the law is to reintroduce the gray wolf. Ranchers and hunters strongly opposed the move and now the federal government wants to take the gray wolf off the endangered species list. NPR's Elizabeth Shogren reports, this time, it is the scientists who are protesting loudly.
ELIZABETH SHOGREN, BYLINE: Ecologist Carlos Carroll is walking through the snow in a wide valley in Northern California.
From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.
Car companies have already begun to design cars that can drive themselves. But to make these smart cars really useful, they'll also need smart roads. As part of his series, "Joe's Big Idea," NPR science correspondent Joe Palca has this story about some computer scientists who were designing a smart traffic intersection. How smart? Well, it can keep traffic flowing at least 10 times faster than old-fashioned intersections.