Whale-watching is a popular activity off New Hampshire's coast, but what do we really know about these huge marine mammals? We hear from a paleobiologist who's written a new book "Spying On Whales: The Past, Present, and Future of Earth's Most Awesome Creatures," about the evolutionary history of whales. We also look at the ecological success of the humpback whale, and consider the North Atlantic right whale, teetering on the edge of extinction. And we look at whale preservation efforts made by