<p>Evolutionary biologist Dr. Bret Weinstein returns to explore the latest developments in gene splicing, stem cells, lifespan extension, the search for extraterrestrial civilizations, and the next (and perhaps final) step in human evolution - the Fourth Frontier.</p> <p>Dr. Bret Weinstein is host of the DarkHorse Podcast and a Visiting Fellow in the James Madison Program at Princeton University. Follow him on Twitter at @BretWeinstein.</p>

Hold These Truths with Dan Crenshaw

Darwinism, Immortality & the Fourth Frontier: The Next Step in Human Evolution, with Dr. Bret Weinstein

Congressman Dan Crenshaw joins the world's leading experts for deep and insightful conversations about the most important issues facing us today.