Three-Fingered Salute, Qualified Immunity, Plant Nanobionics

Today on Top of Mind: First, how a salute used by characters in The Hunger Games novels became a real-life symbol of revolution. Then, police reform negotiations fell apart in Congress this week over the topic of qualified immunity; we’ll find out what that is. And, training plants to detect soil contamination and send word to the lab. Next, the real history of how McDonald’s became so ubiquitous in Black neighborhoods across America. Also, only Congress can declare war. But that’s not how things have worked in America for decades. Finally, a solution to the overflowing outhouses plaguing remote corners of state and national parks. (AP Phioto/Sakchai Lalit)