A school of Blue Tang fish swimming together off the Caribbean island of Bonaire. It has long been assumed that the schooling behavior of fish evolved in part to protect animals from being attacked by predators.
Credit David J. Phillip / AP
Starlings fly over the Piazza Venezia as night falls in Rome.
By tricking live fish into attacking computer-generated "prey," scientists have learned that animals like birds and fish may indeed have evolved to swarm together to protect themselves from the threat of predators.
"Effectively, what we're doing here is we're getting predatory fish to play a video game," says Iain Couzin, who studies collective animal behavior at Princeton University. "And through playing that game, through seeing which virtual prey items they attack, we can get a very deep understanding of as to how behavioral interactions among prey affect their survival."
Refinance activity continues to boom, fueling the home-loan market. Low interest rates have created a class of "serial refinancers" — those lucky enough to borrow at lower rates — and given them new opportunities to spend their freed up cash.
Settlement attorney Robert Gratz never used to be on a first-name basis with his clients.
"In the past, our practice was such that you'd see people, and that was the end of it," he says.
Gratz now sees the same faces all the time, of clients refinancing again and again — these days in the mid-3 percent range.
For more: Why does the government subsidize crop insurance in the first place? We try to answer that question in our latest podcast.
The federal government spends about $7 billion a year on crop insurance for U.S. farmers. Policies are sold by private companies, but the government sets the rates, so the companies can't compete on price.
People enjoy a sunny day on the beach in Knokke, on Belgium's North Sea coast, in April 2011. This summer, the weather hasn't been as nice — and resort owners and officials are feeling litigious over a pessimistic weather forecast.
Parts of Europe are experiencing extremely rainy weather this summer. But some tourist towns in Belgium and the Netherlands say their season has been blighted too — not by bad weather but by bad weather forecasting.
The mayor of the Belgian seaside resort of Knokke says it's a crime that tourism there is down this year. He means that literally.
A barista processes a customer's payment using Square, a device that turns a mobile device into a card swiper. More businesses are using the devices to simplify credit card payments. Others are embracing technology that allows consumers to pay with their cellphones.