It’s most likely that Menachem Bodner last saw his identical twin in 1945, in Dr. Josef Mengele’s gruesome Auschwitz laboratory. He was 4 then and doesn’t remember his time in the notorious death camp. But in the 68 years that have followed, Bodner says he’s “always” been certain he was one of a pair. He just didn’t have any proof until this past year. Now, he’s searching for Jeno, a man who probably looks just like him, and who has a distinctive “A-7734” tattoo on his forearm. And 1 million Facebook users are helping him look.