Technological advancements in the past decade have now made it possible to date the oldest of the tools to about 20,000 years ...

2 Wolfson Unit of Clinical Pharmacology, University of Newcastle, Newcastle upon Tyne NE2 4HH, UK; National Institute for Clinical Excellence, MidCity Place, 71 High Holborn, London WC1V 6NA, UK 3 ...

Correspondence to: Dr M Stroud Institute of Human Nutrition, Mail point 113, F Level, Southampton General Hospital, Tremona Rd, Southampton, UK; m.a.stroudsoton.ac.uk ...