09 May 1997
Vol 276, Issue 5314

About The Cover

One of the well-preserved squash seeds (Cucurbita pepo) (13.8 millimeters long) excavated from Guilá Naquitz cave in Oaxaca, Mexico, that has been dated by the accelerator mass spectrometer carbon-14 technique. The seeds provide evidence that this plant species was first domesticated in Mexico 10,000 years ago. See 932 and the News story on 894. [Photo: Carl C. Hansen, National Museum of Natural History, Smithsonian Institution]