To mark the nation's 250th birthday, host Dave Schlom is joined by California State University Chico geography professor Don Hankins to discuss what California would have been like in 1776.

Host Dave Schlom gets to delve into his favorite pastime, fly fishing, with two of his heroes -- Mike Mercer and Bryan Quick from The Fly Shop in Redding, California.

Host Dave Schlom is joined by two scientists from the SETI Institute in Mt. View, California, to talk about one of hisfavorite celestial phenomena -- comets.

Host Dave Schlom is joined by neuroscientist and animal intelligence advocate Dr. Lori Marino, who was recently named the 2026 winner of the Frank Drake Award by the SETI Institute in Mountain View, California.

Host Dave Schlom is joined by nature and wildlife photographer Tom Murphy for an in-depth conversation about his life and career.

Host Dave Schlom is joined by British humorist and financial writer Dominic Frisby.

Host Dave Schlom is joined by science educator and author Trisha Muro to discuss her new book, It's (Just) Rocket Science: Exploring Physics Through Spaceflight Missions.

Host Dave Schlom is joined once again by Joe Gaydos and Bob Friel from the SeaDoc Society based on Orcas Island in the Pacific Northwest.

Blue Dot's host Dave Schlom is joined by Canadian conservation biologist and marine bird expert Louise K. Blight to talk about her new book, Where The Earth Meets The Sky: A Story of Penguins, People, and Place in Antarctica.

Blue Dot host Dave Schlom takes a look at rivers from space and on the ground in this fluvial episode.