On The Gist, Maria Konnikova of the New Yorker addresses the burning questions of the summer season, including the truth about SPF and the weirdness of ice cream headaches. Plus, filmmaker Jennifer Nelson explains how new research may finally restore “Happy Birthday to You” to the public domain. For the Spiel, what are Trump’s chances? Today’s sponsors: The Great Courses, engaging audio and video lectures taught by top professors. Courses like  “Scientific Secrets for a Powerful Memory.” Right now, get 80 percent off the original price when you visit thegreatcourses.com/gist. And by Citrix GoToMeeting. When meetings matter, millions choose GoToMeeting. Get a free 30-day trial by visiting GoToMeeting.com and clicking the “try it free” button. Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at slate.com/gistplus.

Learn more about your ad choices. Visit podcastchoices.com/adchoices