NATO is racing to find out why crucial communication lines are being damaged in the Baltic Sea, and some officials are placing blame. New research in space could potentially improve heart health on Earth. A Japanese adventurer crosses the finish line after crossing a continent. A U.S. national event honors the corn chip. And researchers capture an incredibly elusive shrew on camera.

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Today's episode was sponsored by EF Educational Tours. Win a trip for up to 10 students and go anywhere EF travels for FREE! Teachers, please go to eftours.com/worldatoz and enter by February 23rd.