It all started with 16-year-old environmental activist Greta Thunberg. Last August, Thunberg started skipping school on Fridays to protest outside Sweden’s parliament, insisting her country get behind the Paris Climate Agreement. Her protests have inspired thousands of young people around the world to join the #FridaysForFuture movement, skipping school to demand that their governments take action against climate change. And on Friday March 15th, these young people will take things a step further—joining together across more than 90 countries and 1,200 cities in the Youth Climate Strike. Sarah Kaplan, science reporter for the Washington Post, reports live from the scene of one of those stikes in Manhattan’s Columbus Circle. Plus, Ira speaks with Isabella Fallahi, Youth Climate Strike organizer and Varshini Prakash, executive director and co-founder of the Sunrise Movement about what’s inspiring this current moment of youth-led activism.

Each year, approximately 1,800 high school science students take part in the Regeneron Science Talent Search (Regeneron STS), a program of Society for Science & the Public. This year’s projects ranged from studying the viscosity of molten lava to investigating more fuel efficient airplane designs to creating a computer model to predict refugee migrations. Senior Samuel Weissman analyzed the genetic makeup of two HIV patients, and senior Ana Humphrey created a math model to look for exoplanets. Ira talks with them about their winning projects.

As we can all attest, climate change is creating more fluctuating temperatures. Normally, snowflakes form high up in the atmosphere, and crystallize into their pretty structures as they pass through cold layers of air. But with warmer temperatures, snowflakes can partially melt on their way down. There’s more water in the air these days, and it acts like a glue that can glom onto the snowflakes, covering them with little ice pellets. Add in the wind and the snowflakes can smash together, turning into mega snowflakes. To add insult to injury, after these snowflakes land they melt faster because they’re less able to reflect light. This has serious implications for flooding and hydrology as well as spring vegetation. When melting occurs normally, the nutrients in the snowpack are absorbed into the soil. Not so when it melts away really fast.

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