The Resurrection Of The American Chestnut At the turn of the 20th century, the American chestnut towered over other trees in forests along the eastern seaboard. These giants could grow up to 100 feet high and 13 feet wide. According to legend, a squirrel could scamper from New England to Georgia on the canopies of American chestnuts, never touching the ground. Then the trees began to disappear, succumbing to a mysterious fungus. The fungus first appeared in New York City in 1904—and it spread quickly. By the 1950s, the fungus had wiped out billions of trees, effectively driving the American chestnut into extinction. Now, some people are trying to resurrect the American chestnut—and soon. But not everyone thinks that’s a good idea. Reporter Shahla Farzan and “Science Diction” host and producer Johanna Mayer bring us the story of the death and life of the American chestnut. ’Don’t Look Up’ Asks If Satire Can Stir Us From Climate Apathy What if scientists warned of a certain upcoming doomsday and no one took them seriously? That’s the plot of director Adam McKay’s latest dark comedy, Don’t Look Up. Two astronomers discover a comet that’s heading towards the Earth. The catch: There’s only six months and 14 days to avert a total annihilation of humanity. The scientists, played by Leonardo DiCaprio and Jennifer Lawrence, embark on a media campaign to convince the world and the president, played by Meryl Streep, to take the threat seriously. Joining Ira to talk about the parallels between this movie and real world crises like climate change and COVID-19 are Sonia Epstein, executive editor and associate curator of science and film at the Museum of the Moving Image in New York City, and Samantha Montano, assistant professor of emergency management at the Massachusetts Maritime Academy, based in Buzzards Bay, Massachusetts. Montano is also the author of Disasterology: Dispatches from the Frontline of the Climate Crisis. Surfing Particles Can Supercharge Northern Lights For thousands of years, humans have been observing and studying the Northern lights, aurora borealis, and their southern hemisphere counterpart, aurora australis. The simplest explanation for how these aurora form has been unchanged for decades: Charged particles, energized by the sun, bounce off the Earth’s protective magnetic field and create flashes of light in the process. But for a long time, scientists have known it was more complicated than that. What exactly gives those incoming particles the energy they need to create the patterns we see? And why are some aurora more dramatic and distinct, while others are subtle and hazier? Aurora researcher Jim Schroeder explains new work published in Nature Communications that suggests that in more vivid aurora, electrons may “surf” waves of energy from space into our atmosphere. The waves, called Alfvén waves, are a side effect of the solar wind warping the Earth’s magnetic field. Schroeder explains the weird physics of our aurora, and what we could learn about other objects in the universe as a result.    Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.