A marine invisibility cloak that can now also be used to save lives: Shrimps helped the Allies win WWIl by helping the navy hide their submarines in the beds of snapping shrimps, rendering them undetectable. The snapping shrimp is one of the loudest creatures in the ocean capable of drowning out submarine sonar by its “snap” that uses bubbles. These shrimps are tiny, just 5 cm long, which to Radiolab’s producers is “a mystery, shockingly hot, and vanishingly tiny.” Now, researchers are using the insights from the shrimps’ “snapping” technique to administer chemotherapy drugs intravenously using targeted ultrasound, along with tiny air bubbles generated. “We’ve never had access to the drugs in the brain that way before … it’s like a whole new frontier,” producer Molly Webster says. (Run time 23:34)