Hwang Woo-Suk is the bad boy of genetics. He’s most famous for falsely claiming to have cloned human stem cells. This is, you can imagine, very bad in science. Yet last week, the South Korean researcher was in Siberia, drilling cells from the bones of a 28,000 year-old frozen wooly mammoth. The bones are the only place Hwang is going to find the DNA he needs to bring a mammoth back to life.