Across the Americas people looked up today, as a total solar eclipse journeyed across Mexico, toward the United States and Canada. The skies above delivered a huge communal opportunity across what can only be described as a bitterly divided country. As it started to pass across the Americas, physicist, mathematician, and author Brian Greene joined the program to discuss what made it so special.  Also on today's show: Sharone Lifschitz, Father held hostage in Gaza; David Autor, Ford Professor of Economics, MIT  Learn more about your ad choices. Visit podcastchoices.com/adchoices