Arlene Aguirre, who brought her conjoined sons to America in hopes of giving them a normal life, said Monday she could barely believe it when one of the twins took his first steps into her arms. ``The first time I saw him walking, I just started crying,'' she said. ``I just pinched myself. It's just like I was dreaming. ... I said, `Clarence, is that really you?''' Clarence Aguirre was 3 years old, much older than most kids, when he started walking in late August. But the milestone came barely a year after he and his brother Carl, who were...