Wednesday on the NewsHour, a deadly tornado devastates an Iowa town, killing multiple residents and injuring many more. Democratic lawmakers call for a criminal investigation into what they call big oil's deception about the impact of fossil fuels on climate change. Plus, we look at the role social media plays in the rise in violent crime committed by young people in America. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders