Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.

Calvin saying to Hobbes

Calvin and Hobbes (comic strip), 8 November 1989

Bill Watterson Quotes

Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.

Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.

Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.

Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.