The Great American Total Solar Eclipse is less than two months away. It's a rare phenomenon that will cross the United States from coast to coast. NASA scientists recently held a briefing for reporters and the public about what to expect, how to watch the celestial event safely, and what researchers hope to learn. Listen to part of that briefing, as well as a Minnesota couple who has been traveling the globe to chase eclipses for more than 35 years.

It's time to ask the captain! Mark interviews commercial airline pilot Charlie Schaffer and asks all the questions you want answered. Charlie dispels some aviation myths, talks about his top tips for passengers and what they should not do on an airplane, how aviation has changed in the decades he's been flying, what he thinks about the U.S. government's electronics ban, and his favorite places to fly.

Come explore caves with us! We descend into these underground cathedrals with the National Speleological Society. Incoming president Geary Schindel shares with Mark his love of caving, the best caves in the United States and around the world, and how to get into caving for free in your local community.

The Frugal Traveler columnist for The New York Times, Lucas Peterson, dishes on his favorite destinations, deals, and dinner. Lucas chats with Mark about how he finds his savvy travel bargains; how he plans his trips and writes them for savvy readers; and his passion as a foodie, which he shares with viewers as the host of 'Dining on a Dime' on Eater. And he reveals his top tips for travelers.