Bill Nye & Neil deGrasse Tyson. You can listen to the both of them here:
http://www.startalkradio.net/this-sundays-episode-startalk-live-the-particle-party-part-1/

Bill Nye & Neil deGrasse Tyson. You can listen to the both of them here:

http://www.startalkradio.net/this-sundays-episode-startalk-live-the-particle-party-part-1/