Only in China. They have the coolest and strangest stories. Sill like the one abut the hundreds of dead pigs floating down river.
This tumor has a name: teratoma, and it happens all over the world, not just in China.
The ability of the human embryo to become twins occasionally divides unevenly, resulting in a second ‘twin’ that is a clump of many different kinds of cells.
This phenomenon is also why the use of embryonic stem cells has proved so spectacularly unsuccessful. The cells that the researchers are trying to control are not controllable by human effort. They carry the genetic message for a human life that could last a 100 years.