Health · Investigation
Ebola's fastest week: what eastern Congo is testing
More than 1,500 deaths, and a caseload that grew by half in seven days. The response plan assumed a curve this outbreak is not following.
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Space
A sea of polygons on Mars, and the weather that made them
The shapes only form when ground ice freezes and thaws in cycles. Mars, at some point, had seasons that mattered.
Astronomy
The first moon outside our solar system may already be found
A Jupiter-mass object orbiting a brown dwarf fits every test for an exomoon except confirmation.
