Are We Alone? A Tête-à-Tête Between Neil deGrasse Tyson and Peter Ward Despite decades of concerted effort by radio astronomers working on the project known as SETI, the Search for Extraterrestrial Intelligence, we've had no sign of beings elsewhere in the universe that match or exceed us in smarts. That's just one of many pieces of evidence that paleontologist Peter Ward, coauthor of Rare Earth: Why Complex Life is Uncommon in the Universe, points to when claiming that intelligent life beyond Earth must be exceedingly rare. Since many other scientists believe advanced life is common out there—Carl Sagan estimated...