I thought I knew a lot about the Titanic. After all, I watched Leonardo DiCaprio and Kate Winslet “fly” on the bow in theaters at least three times back in 1997 (“Never let go, Jack”). My kids learned the basics (big boat sank) at school this year, so they were excited to see it “IRL” at Titanic: Echoes From the Past just off the BeltLine. The immersive virtual reality experience opened recently at 550 Somerset Terrace, next to the Illuminarium.