Humpback whales often hunt in groups—using an impressive technique known as "bubble-net feeding.” The whales dive beneath a school of fish and swim in tight circles, while exhaling. This builds a dense ring of rising bubbles, which functions as an invisible barrier for the fish. Also: China and Europe's joint SMILE mission explores the effects of solar storms on the Earth’s magnetic field. Plus: Space stress tests in the lab—how do isolation and unforeseen events affect astronauts? Why do some animals hibernate? And: How scrolling alters our perception of time!