Are we alone in the universe? That's the question Astrobiologist Dr. Graham Lau spends every day trying to answer. In this in-depth interview, we talk finding life on other planets, Shadow Biospheres here on Earth and what happens if we find intelligent life - or it finds us. Then, because we all have that only sketchy cousin, we countdown the Top 5 Annoying Family Members.Astrobiologist/Cosmobiologist Dr. Graham Lau: Learn more about your ad choices. Visit megaphone.fm/adchoices