A team of physicists at Grenoble University in France discovered that trees make different sounds when they are starved for water versus when they are simply thirsty. We hear from Dr. Alexandre Ponomarenko, the lead researcher, and hear a bit of the thirsty tree sounds.
The U.S. Navy is planning to ramp up training activities off California and Hawaii. But that has rekindled a battle over Navy sonar, which is known to harm marine mammals. From member station KQED, Lauren Sommer reports.
LAUREN SOMMER, BYLINE: We humans are visual creatures and for good reason. If someone is far away, you can usually see them before you hear them. Underwater, it's the opposite.
BRANDON SOUTHALL: The physical environment of the ocean really favors the use of sound, and the animals have evolved accordingly.