We talk to Graham Brookie of the Atlantic Council about Turning Point USA, a pro-Trump youth group that has been paying young conservatives to make false posts online claiming that mail-in ballots will lead to election fraud. Brookie says this kind of domestic misinformation is more dangerous than foreign because of its scale and scope. Also, a group of researchers from 20 countries is about to conclude what they're calling the largest polar expedition in history. We talk to one of the researchers.