Radio Free Europe – Once seen as a Cold War relic, Radio Free Europe has become a vital tool in today's battle against disinformation and authoritarianism, especially since Russia's invasion of Ukraine. American taxpayers pay for RFE's $140 million budget, which recently got a bipartisan boost from Congress. Bill Whitaker visits the RFE headquarters in Prague and meets the brave journalists behind its fearless reporting. The Vanishing Wild – Scientists are sounding an alarm that we are living amid Earth's sixth mass extinction; the last one was 66 million years ago when an asteroid hit the Yucatan peninsula and wiped out the dinosaurs. They predict we are just 20 years away from life being altered on Earth again. Scott Pelley speaks with experts who offer solutions to what they call one of the most urgent global problems. Obesity – Obesity is the second leading cause of preventable death in America after smoking. Lesley Stahl reports on a new medication that helps with weight loss but is wildly expensive and covered by very few insurance companies.