The two most common elements in the universe are Hydrogen and stupidity.
Harlan Ellison (1934 - )

If you want to make an apple pie from scratch, you must first create the universe.
Carl Sagan (1934 - 1996)

Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.
Bill Watterson (1958 - ), cartoonist, "Calvin and Hobbes"