The Food and Drug Administration approved the sale of Narcan, a nasal spray used to treat opioid overdoses, for over-the-counter, non-prescription purchase. There are still challenges, like the high cost of this life-saving medication, that may present barriers to access. Dr. Nora Volkow, director of the National Institute on Drug Abuse, joins us. And, Major League Baseball kicks off the season with a host of new regulations designed to speed up the flow of the game a reduce injuries. There's also a first-of-its-kind deal for Minor League players. The Washington Post's National baseball reporter Chelsea Janes joins us. Then, space is vast, stunning and described by many as unknowable. Astronomer Dean Regas is not among them. He's the author of a new book called "1,000 Facts About Space" that's aimed at children but is sure to interest and delight adult readers as well. Regas joins us.