The mother's DNA tests showed that she’s also the uncle of her daughter. Doctors realized that the mom was a human chimera with DNA from more than one fetus. Last year two cases of human chimeras made headlines. The first was singer Taylor Muhl from California who discovered that she has two types of DNA: hers and her non-existent twin sister. That is, in her mother's case, two separate eggs were fertilized by two different sperm cells yet Taylor absorbed the genetic traits of the second embryo in the first stages of development. In Greek mythology, the chimera is a...