"<a href=""https://www.youtube.com/watch?v=JTmxA2MvEqk&amp;t=6m45s"">6:45</a> It is a common thought amongst science world that life developed multiple times in different parts of the world. 2-3 or 4 times is what is considered to be true. I thought it developed only once ad well but that doesn't seem to be true.<br><br><a href=""https://www.youtube.com/watch?v=JTmxA2MvEqk&amp;t=7m20s"">7:20</a> I don't understand how intelligence is "inevitable"? There's only one intelligence left alive right now able to build spaceships and that's us. If we didn't exist it would be 0 out of billions of species. That's not even 0.0001 percent."