Are we alone in the universe?

The universe is so incredibly  large, beyond our imagination, that I have always thought it’s egotistical for anyone to think us humans are the highest and only forms of life in the entire universe.  As Dr. Neil deGrasse Tyson states there are more stars in the universe than all the grains of sand on earth.  In this video he describes the logic behind the idea that there are other more intelligent forms of life out there.  I find his argument incredibly compelling.