60 Late Middle Eocene primate from Myanmar and the initial anthropoid colonization of Africa.
http://www.pnas.org/content/109/26/10293.abstract
59 Fluvial landscapes of the Harappan civilization.
http://www.pnas.org/content/109/26/E1688.abstract
58 First dairying in green Saharan Africa in the fifth millennium BC.
http://www.nature.com/nature/journal/v486/n7403/full/nature11186.html
57 Dating of calcite crusts overlying art in Spanish caves shows that painting began more than 40,000 years ago.
http://www.sciencemag.org/content/336/6087/1409.abstract
56 First wave of cultivators spread to Cyprus at least 10,600 y ago.
http://www.pnas.org/content/109/22/8445.abstract
55 Reconstructing the origin and spread of horse domestication in the Eurasian steppe.
http://www.pnas.org/content/109/21/8202.abstract
54 Nest-building orangutans demonstrate engineering know-how to produce safe, comfortable beds.
http://www.pnas.org/content/109/18/6873.abstract
53 Single amino acid radiocarbon dating of Upper Paleolithic modern humans.
http://www.pnas.org/content/109/18/6878.abstract
52 Dinosaur morphological diversity and the end-Cretaceous extinction.
http://www.nature.com/ncomms/journal/v3/n5/full/ncomms1815.html
51 Origins and Genetic Legacy of Neolithic Farmers and Hunter-Gatherers in Europe.
http://www.sciencemag.org/content/336/6080/466.abstract
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