These days, Ashton Kutcher is anything but vain. When he appeared on TBS' Conan Monday to promote The Ranch, Conan O'Brien took a moment to compliment his guest. "You always look good," he said. "You've got good hair." "I'm going a little bit, though. I'm losing it," the 40-year-old actor said. Running his fingers through his thinning hair, he added, "If I really get up in there, guys, it's starting to disappear." "When I was like 25, I noticed it was starting to go. I went to the hair guy doctor, and he put me on this medication called Avodart. Have you ever heard of this stuff?" Kutcher said. Essentially, he said, "Your body produces...