The sheer volume of remarkable Texan exploits creates a dizzying tally for the proudest of its citizens. So it happens that inexplicable marvels slip past an entire state of storytellers and world-famous legends live as anonymous neighbors. Ever hear the story about the escaped ape in the Big Thicket? Or the Interplanetary Capital of the Universe that sat on the Gulf Coast? Does the cowboy hat that warmed U.S.-China relations ring a bell? From the...