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68K views · 364 reactions | What happens when you lose a keystone species, like sea otters or kelp? Find out in "Extinction: The Facts,” now streaming on the PBS Video app. | PBS | Facebook

Did you know? 70% of all antibiotics were derived from a natural molecule, many from plants. Find out what is at risk in "Extinction: The Facts," now streaming on the PBS Video app. | PBS

Is your family excited to meet Luna the moon? Watch LET'S GO LUNA! on the free PBS KIDS Video App. New episodes begin on March 4. | PBS KIDS