A map of neurons of the mouse retina, reconstructed automatically by artificial intelligence from electron microscopic images. A. Zlateski based on data from K. Briggman, M. Helmstaedter, and W. Denk/MIT/Seung hide caption

itoggle caption A. Zlateski based on data from K. Briggman, M. Helmstaedter, and W. Denk/MIT/Seung

A scene from Stalker, Andrei Tarkovsky's 1979 sci-fi film based on the novel Roadside Picnic by Boris and Arkady Strugatsky. /The Kobal Collection hide caption

itoggle caption /The Kobal Collection

Cover detail: The Hundred Dresses hide caption

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A woman walks past a banner placed around the perimeter of the Rand Afrikaans University in Johannesburg on World AIDS Day. The university used the banner to raise public awareness about AIDS and the devastating toll the disease has had in South Africa. Paul Botes/AP Photo hide caption

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Astrophysicist Neil deGrasse Tyson says valuing space exploration "transforms the culture into one that values science and technology." AP hide caption

itoggle caption AP