SURVIVING A TORNADO in a Kevlar bunker. “Swenson said her shelter, made by the Wilmington, Del.-based DuPont Co., didn’t budge, even as the twister blew a hole in the garage ceiling above. . . . Swenson stayed inside that shelter until the tornado passed. When she exited, unlike her shelter, her entire neighborhood was demolished. More than 130 people in her town were killed.”