Steven Kotler, The Angle Quickest for Flight

"What do the following things have in common:  President James Buchanan; the two-toed sloth; the chow chow; the hyoid bone; mercury; -40 degrees; Kahoolawe; the pyramids; Midnight Cowboy; the flags of Nepal, Libya, and Ohio?"

"President James Buchanan was the only bachelor president; the two-toed sloth is the only land mammal besides man that mates face to face; the chow chow is the only dog with a black tongue; the hyoid bone, which supports the tongue, is the only bone in the human body that doesn't touch another bone; mercury is the only metal that's liquid at room temp; -40 degrees is the only temp where fahrenheit and celsius thermometers read the same; Kahoolawe is the only uninhabited Hawaiian Island; the pyramids are the only one of the seven wonders of the ancient world still standing; Midnight Cowboy is the only x-rated film to win the academy award for Best Picture; Nepal is the only country with a non-rectangular flag; Libya is the only country with a single color flag; and Ohio is the only state with a non-rectangular flag.....One of a kinds, all of them."