We're less than three days away from the total solar eclipse that will be seen in the U.S., Mexico and Canada. Monday's eclipse will cut across 13 states with more than 30 million people living in the path of totality while millions more are traveling to get a good look. Science correspondent Miles O'Brien and astrophysicist Neil DeGrasse Tyson have a viewer's guide on what you need to know. PBS News is supported by - https://www.pbs.org/newshour/about/funders