Photos: Prehistoric Rock Art Hints at Elite Class on Kisar

Effects of trade

Indonesian rock paintings

(Image credit: Sue O'Connor/ANU)
Live Science Contributor

Tom Metcalfe is a freelance journalist and regular Live Science contributor who is based in London in the United Kingdom. Tom writes mainly about science, space, archaeology, the Earth and the oceans. He has also written for the BBC, NBC News, National Geographic, Scientific American, Air & Space, and many others.