00:00The clams are dropped into a water tank with their shells wide open.
00:04But the moment contaminated water flows in, they slam shut all at once.
00:09You see, in the wild, clams pull water through their bodies to eat tiny bits of food floating inside.
00:16But if the water is too dirty, they instantly close to protect themselves.
00:21So scientists attach a small piece of metal to each clam's shell.
00:25And when the clam shuts, the metal taps a sensor and that triggers a warning.
00:30This method is used to monitor the water supply for contamination.
00:34And as long as their shells stay open, the water is safe to drink.
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