The organizer behind Saturday's so-called "free speech" rally — protested by tens of thousands people — says his group will be back with future events. “You haven’t seen the last of us,” John Medlar, a spokesman for the Boston Free Speech Movement, told Adam Reilly when he joined him on Greater Boston along with former Boston Police Superintendent-in-Chief Dan Linskey and WGBH News Reporter Bianca Vázquez Toness.

For the first time in nearly a century, a total solar eclipse has crossed over the entire nation. The so-called “path of totality” started in Salem, Oregon and swept across the country to Charleston, South Carolina, before moving out to sea. Scientists were ready and waiting to gather information they can only get during a total solar eclipse – data that could change the understanding of the sun itself and how it affects us here on Earth. It’s the subject of a one-hour special airing on WGBH called NOVA: Eclipse Over America. NOVA’s Senior Executive Producer Paula Apsell joined Adam Reilly to discuss today’s celestial phenomenon.