We're repeating this episode so soon because we can't hear these warnings enough. Hitler and the Nazis assaulted universities, museums and art institutions; purged them of people that Hitler perceived as enemies; and rewrote textbooks and museum exhibits to tell Hitler's fake version of history. Sound familiar? Historian Joan Clinefelter, who retired recently from the University of Northern Colorado, says there are differences between Hitler in his early days and Trump. "But I think they have the same ultimate goal," Clinefelter tells us, "which is ideological purity, sort of a cultural cleansing of history [and] of culture - so that it only gives the message that they believe is appropriate - and getting rid of anybody who has any sort of dissenting point of view."

It sounds almost ridiculous to say this, but when people talk about wars or floods or wildfires or drought, they often neglect the fact that roughly half of the victims are children. Yet, the officials who dispense aid usually treat the kids as statistics and ignore their special needs. For instance, consider that children's brains are still developing - so if they're malnourished or sick or stressed, even temporarily, it can damage them for the rest of their lives. Sweta Shah is trying through her work with the Brookings Institution and her NGO, ChildArise, to help children in crisis around the world - including in America. And here's one of her strategies: get children themselves to talk about their needs!

Scientists have been trying for decades to understand these magnificent creatures, which can grow longer than a typical house. Michelle Fournet and her colleagues at the University of New Hampshire have been breaking new ground: They record the whales' daily communications in Alaska, and then send whale recordings back to the giant animals to see if and how they respond. Some of Michelle's latest findings suggest that they can identify individual whales by their sounds. Michelle tells us the moving story of how she morphed from broke actor to internationally-respected whale researcher, and how she hopes research on humpbacks' "language" can help humans protect them - and respect the natural world better.