Protecting whales from ship strikes

Endangered whale species (like blue whales, humpbacks, and fin whales) face a major threat on the high seas: cruise and container ships that have difficulty avoiding collisions with whales. Correspondent David Pogue talks with a marine ecologist at Woods Hole Oceanographic Institute, whose fleet of autonomous vehicles helps track whales in shipping lanes; and finds out how container ships may be able to reduce striking whales.