At 5:04 p.m. on October 17, 1989, two decades after he served as a combat soldier in Vietnam, Lance Johnson felt the tremors of San Francisco’s Loma Prieta Earthquake from his apartment in Marin County. He took his cup of coffee to the couch, switched on the news and saw a live feed of the fire and destruction happening 40 miles south. Suddenly, he was hit with some of the common symptoms of post-traumatic stress disorder (PTSD). As he recalls: Someone tripped a switch in my head, and instantly, I was back in Vietnam. In my mind, the concept of time suddenly meant nothing, and I traveled a wormhole in space from San Francisco to twenty years earlier in Southeast