All Things Considered host Ari Shapiro returns to nerd-out with Regina G. Barber and EvoAIGeoff Brumfiel on science in the news. They discuss the discovery of new gravitational waves, a robot prototype that draws design inspiration from nature and why orcas might be attacking boats along the coast of Europe.

A 'multi-modal' robot, inspired by nature

This week in the journal Nature Communications, a group of scientists describe a new robot they're working on — with funding from NASA's Jet Propulsion Laboratory — inspired by the way animals use their limbs to move in different ways. They call it the "Multi-Modal Mobility Morphobot," or M4. It's being developed with search-and-rescue in mind, but could be useful in future space exploration as well.

Researchers have uncovered a new kind of gravitational wave

Scientists have new evidence that the fabric of space and time is rippling with gravitational waves as big as the Milky Way. The waves could be created by some of the biggest black holes in the universe. Black holes are thought to send out these elusive waves when they merge. Until now, researchers have only been able to detect gravitational waves from much smaller black holes. These newly detected waves could be a signal from the dawn of the universe itself. Learn more from NPR's Nell Greenfieldboyce.

Orcas are attacking boats — and scientists can only guess why

As NPR's Scott Neuman reported this month, scientists can only guess why orcas — also known as killer whales — continue to attack boats in and around the Strait of Gibraltar, a busy waterway that links the Mediterranean Sea with the Atlantic Ocean. One theory suggests the whales' action is the result of trauma. Others think it may be a form of play.

Have questions about science in the news? Email us at shortwave@npr.org.

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This episode was produced by Megan Lim and Carly Rubin. It was edited by Rebecca Ramirez, Brent Baughman and Christopher Intagliata. Brit Hanson checked the facts. The audio engineers were Ted Mebane and Robert Rodriguez.