The girl saying "um", and Neil deGrasse Tyson telling a beautiful story about Isaac Newton.
From the video "SciCafe: Life the Universe and Everything with Neil deGrasse Tyson" recorded at the Hyden Planetarium in 2010.
Bill Nye talks about human insignificance on the planet Earth at
1:05:30: "I suck!"
NASA Astronaut Karen Nyberg, a little girl says: "I want to be an astronaut when I get older" at 32:30
Bill Nye says: "The universe is not only expanding, it's accelerating. And you know why? Nobody knows why!" From the video titled "Our Future In Space: Lawrence Krauss Neil deGrasse Tyson Bill Nye 2011".
Neil de Grasse Tyson talks about Baumgartner's jump from the baloon.
The funny presentation of the scale of the universe starts in this video at 33:09.
From the video "A Conversation with Dr. Neil deGrasse Tyson (Full Session) | Interactive 2014 | SXSW".
Richard Dawkins answers what is the difference between faith in science and faith in god.