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Carl Sagan would have been 77 today.  Sagan, better than anybody else, understood both the insignificance of <i>homo sapiens</i> in the cosmic scheme of things, and of the importance of our fragile humanity, and our ties to the earth. His wisdom, humility, and ability to evangelize the wonders of science are sorely missed. But his voice and his ideas live on forever, on our pale blue dot, and carried out into the universe on ever spreading radio waves. He would have liked that, I think.

Happy Birthday, Carl Sagan!