Is the earth's circumference increasing because of sea level rise? Where does the term CEO come from, and how did it become so widespread? Edgar B. Herwick III, the man behind GBH's Curiosity Desk, joins Paris and Jeremy to discuss. Plus: Cambridge's migrant shelter is only open at night, leaving families staying there out on the street during the day. So what can be done to help, and who has jurisdiction to decide? State Rep. Mike Connolly of Cambridge joins Jeremy to talk about it.