BY SUSAN ESTRICH Sam Berns died last week, at the age of 17. I never knew him, but he touched my heart – and those of so many others. I first saw his picture years ago. A teenager weighing 50 pounds and looking like a man in his 70s, facing almost certain death sooner rather than later, is not someone you easily forget. Sam had a rare disease known as progeria. He was diagnosed at […]