We seen a lot of airshows, but never have we seen two planes flying so close to each other. These two daredevil Japanese pilots, flying Kawasaki T4 jets, are part of Japan's equivalent of the U.S. Blue Angels and Thunderbirds, called the Blue Impulse Demonstration Squad.

The two main reasons supersonic flight hasn't caught on (other than the late, great Concorde) are the amount of fuel it takes to achieve such high speeds and the deafening, potentially destructive sonic boom that occurs when crossing the sound barrier. Well, NASA has a gorgeous new concept plane that addresses both issues.

Today we celebrate Columbus Day, commemorating the trans-Atlantic voyage of three ships that represented the pinnacle of technology circa 1492. On board were scores of courageous sailors, many of whom believed they might end up fighting for their lives...