How did what could be the largest human organ elude us until 2018?

Back when he was a young student in medical school some 30 years ago, pathologist Neil Theise wasn't taught much about a common, widespread connective tissue in human bodies. Scientists assumed it was just a typical connective tissue, so they didn't look much further. "You see what you’re prepared to see," Theise, now a pathologist at New York University's Langone Medical Center, said in an interview. Now, he knows differently. "It looks like it's connective tissue — but it's not." T