Physical pain is problematic because it's very difficult to transcend that. Sometimes you're just in physical pain, and that's a bummer. Even then, there are beautiful things involved in the healing of that. I've experienced some. — Alex Ebert Copy Share Image
Adult stem cells are also problematic, as they are difficult to identify, purify and grow, and simply may not exist for certain diseased tissues that need to be replaced. — Eliot Engel Copy Share Image
