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
30 Comparison of real lizards with a robotic version and a dinosaur model shows that lizards use their tails to control body pitch in aerial motion by means of transfer of angular momentum from the body to the tail.
http://www.nature.com/nature/journal/v481/n7380/full/nature10710.html
29 New Ophthalmosaurid Ichthyosaurs from the European Lower Cretaceous Demonstrate Extensive Ichthyosaur Survival across the Jurassic–Cretaceous Boundary.
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0029234
28 Global human mandibular variation reflects differences in agricultural and hunter-gatherer subsistence strategies.
http://www.pnas.org/content/108/49/19546.abstract
27 Analysis of SH2 domain–containing proteins provides insights into the evolution of modular protein domains and organismal complexity.
http://stke.sciencemag.org/cgi/content/abstract/sigtrans;4/202/ra83
26 Early humans constructed sleeping mats from local plants, including some with insecticidal properties.
http://www.sciencemag.org/content/334/6061/1388.abstract
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