Questions to Consider on Earth Day

"For most of human history we have searched for our place in the cosmos. Who are we? What are we? We find that we inhabit an insignificant planet of a hum-drum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. We make our world significant by the courage of our questions, and by the depth of our answers."--Carl Sagan in Cosmos. Earthrise, taken from Apollo 8 on December 24, 1968Image Credit: Bill Anders/NASA Our relationshi...