Big Ideas: A Blue Whale's Heartbeat Recorded And Bacteria That Eats CO2

Scientists recorded the heartbeat of the world's largest mammal for the first time and found surprising results with important implications for the conservation of blue whales. Plus, researchers engineered a strain of E. coli bacteria that consumes carbon dioxide in order to reduce greenhouse gases. And, a group of scientists warn that climate change is driving the entire planet to a dangerous "tipping point."