In a new TEDx talk, Alex calls for a science of UFOs ... Why Bob finds two naval sightings credible ... Alex: "There's some decent chance that these things are alien" ... Alex's proposal for a UFO monitoring system ... Might it be suicidal to let ETs know that we know about them? ... Alex: Maybe the aliens are waiting for us to figure it out ... What explains the taboo against academic study of UFOs? ... Alex's willingness to be misperceived as a crank ...

Defining transhumanism ... Why David is pessimistic about the Singularity ... Becoming happier by shifting our "hedonic set points" ... Could we phase out suffering by tackling its genetic roots? ... Can chemicals deliver enduring happiness? ... Why David has never tasted meat ... Is transhumanism a secular religion? ...

Adam's new book, Light of the Stars: Alien Worlds and the Fate of the Earth ... Adam: Climate change is a civilizational inevitability ... How many planets are in our galaxy? Guess again. It’s more than that. ... How pessimists about the existence of extraterrestrial life became optimists ... Why haven't we heard from any aliens? ... Does fighting climate change require spiritual change? ... Why the Gaia hypothesis isn't new-age hooey ... The theoretical archaeology of exo-civilizations ...

The time Michael thought he was being abducted by aliens ... Michael's new book, Heavens on Earth ... Deepak Chopra's afterlife ... Why uploading your brain to achieve immortality makes no sense ... Is radical life extension just bunk? ... The Second Coming, presented by Ray Kurzweil ... What consolation can the atheist offer to the dying? ... The spookiest thing that's ever happened to Michael ...

Why transhumanists want to escape their biological prisons ... The “singularity” and the culture of Silicon Valley ... How biohackers turn technology into performance art ... How do you upload an immaterial mind? ... Over-the-counter life extension: does it work? ...

How to raise a good robot ... The moral development of machines ... The trouble with robots who can reason ... Will AI have feelings? ... Is it wrong to hurt a zombie? ... How AI could shape human morality ...

The bad effects of addictive tech ... How much time do you spend on your phone? ... You might be addicted if... ... The World of Warcraft as a case study in tech addiction ... The tricks Silicon Valley uses to get you hooked ... Adam’s advice for breaking your screen addiction ...

When technology takes people’s jobs ... Asking your iPhone for medical advice ... Killer robots! ... Letting machines decide whether to push the nuclear button ... The growing threat of bioterrorism ... How to stop bioterrorists ... Is it all happening too fast? ...

Changing the human genome to combat climate change ... Will new technologies stratify society genetically? ... Military and civilian uses of memory-changing technology ... The army’s plans for deep brain simulation ... Matthew's book The Right to Be Loved ...

Transhumanism and the singularity ... Teilhard de Chardin’s "Omega Point" ... The (theoretical) physics of immortality and resurrection ... The theism of the simulation theory ... Any word on transhumanist Islam or Judaism? ... Christianity and globalization ...