Tunisia, Spelling Bees, AI Song Contest

Tunisia’s democracy is in crisis. Then, spelling bees provide a fascinating insight into Generation Z. Plus, musicians aren’t worried about artificially intelligent computers replacing them. Also, on today's show: why photojournalists should document the horrors of war; computers small enough to ride on a snail’s shell; how an ecologist gathered and sorted tiny fossils of shark scales to gauge the health of shark populations thousands of years ago.