SNACK ATTACK! I mean... SHARK ATTACK! I mean, BOTH. Another snack-sized episode for you, complete with shark attacks, the story of a chilling shipwreck, and whatever the heck is happening in Area 51.Boston-area listeners, join the Endless Thread team on July 25 at WBUR's CitySpace for a behind-the-scenes look at our five-part series, "Infectious: The Strange Past and Surprising Present of Vaccines – And Anti-Vaxxers." Event info: https://wbur.fm/2XXJIts