September 30, 2017 | Science News

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cover of September 30, 2017 issue
 illustration of the ancestral horse Hyracotherium

In the Sept. 30 SN: Smog's health woes, secrets of the bat brain, slug slime inspires surgical glue, wild beer, Neandertal tar recipes, the sun's recent flare-ups and more.

September 30, 2017