40 Human Evolution Out of Africa: The Role of Refugia and Climate Change.
http://www.sciencemag.org/content/335/6074/1317.abstract
39 The maximum rate of mammal evolution.
http://www.pnas.org/content/109/11/4187.abstract
38 Diverse transitional giant fleas from the Mesozoic era of China.
http://www.nature.com/nature/journal/v483/n7388/full/nature10839.html
37 Reconstruction of Microraptor and the Evolution of Iridescent Plumage.
http://www.sciencemag.org/content/335/6073/1215.abstract
36 Oxygen isotope measurements of fossil teeth show that the body size of the horse Sifrhippus decreased as temperature increased.
http://www.sciencemag.org/content/335/6071/959.abstract
35 The fall of Maya civilization occurred over two centuries when droughts reduced precipitation by up to 40 percent annually.
http://www.sciencemag.org/content/335/6071/956.abstract
34 Oldest known dinosaurian nesting site and reproductive biology of the Early Jurassic sauropodomorph Massospondylus.
http://www.pnas.org/content/109/7/2428.abstract
33 Experimental evolution of multicellularity.
http://www.pnas.org/content/109/5/1595.abstract
32 New evidence on the colour and nature of the isolated Archaeopteryx feather.
http://www.nature.com/ncomms/journal/v3/n1/full/ncomms1642.html
31 The social networks of Hadza hunter-gatherers are structurally similar to modern social networks and show signs of clustering in cooperative behaviour, which suggests that these networks may have contributed to the emergence of cooperation in early humans.
http://www.nature.com/nature/journal/v481/n7382/full/nature10736.html
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