THE Song Keplek man, from anthropological studies, shows Mongoloid racial characteristics. Unexpectedly, though, uranium-thorium dating of the skeleton indicates its age is 7,000 years old. However, under the theory of migration from Taiwan, Mongoloids are supposed to have only arrived in Indonesia around 4,000 years ago.

This is the challenge faced by Wuryantari and the researchers at the Eijkman Institute, Jakarta. They must ascertain wh