The iris of a human eye has two layers of fibers, radial fibers that pry the pupil open and sphincter fibers that snap it shut.
By The Scientist Staff | November 13, 2012
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December 24, 2012
By Abby Olena
According to a new study, wolves can learn from humans.
By Tracy Vence
Re-examination of a thigh bone from one of the earliest putative hominins could impact scientists’ understanding of the origins of human bipedalism, a study suggests.
By Ed Yong
A 400,000-year-old mitochondrial genome adds new twists to scientists’ picture of early human evolution.
View the December 2013 contents.
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