Astrobiologist Dr. David Grinspoon and Leighann Lord answer questions from fans about Venus. NEW: 13-minute “Venusian Update” from Dr. FunkySpoon and Chuck Nice about Japan’s “never say die” Akatsuki orbiter and future US missions to our “Evil Twin.”

Planetary scientist Dr. David Grinspoon answers questions about the human impact on Earth during the Anthropocene Era. Now updated with 13 minutes of Dr. FunkySpoon and Chuck Nice discussing why we must evolve from Homo Sapiens into Terra Sapiens.

Astrophysicists Neil Tyson and Charles Liu answer a feast of fan-submitted questions, ranging from asteroid mining to the heat death of the universe, selected by co-host Eugene Mirman. Plus a new “How Tweet It Is” segment with Neil and Bill Nye.

Get an update from the front lines of the genomic revolution when Neil Tyson interviews Anne Wojcicki, co-founder/CEO of genetic testing company 23andMe. In studio, bioethicist Prof. Robert Klitzman provides perspective. Chuck Nice co-hosts.

We’re waving two very different green flags this week when Neil Tyson interviews NASCAR driver and environmental activist Leilani Münter. Eugene Mirman co-hosts, with guests Dr. Marcia DeLonge and Don Anair of the Union of Concerned Scientists.

Neil deGrasse Tyson explores the “front page of the internet” with Reddit co-founder Alexis Ohanian. Learn about how Reddit got started, net neutrality, trolls and more. With BuzzMachine’s Jeff Jarvis and co-host Eugene Mirman. Hi Neil, I know you are a very busy man, but I have a mission. My girlfriend is studying a lot, she...