How Pandemics End, Earth’s Pulse, Black Smoke

How will the pandemic end—and how will we know it? Plus, it turns out the Earth has a pulse, just like a beating heart. And, why African American pitmasters have been pushed to the margins of the food world’s barbecue obsession. Also, on today's show: how the TV show "Friends" helps students learn English; scientists have learned how to rebuild an immune system; the safety of releasing radioactive water into the ocean.