Image of Mars on a black background Credit: NASA/JPL/USGS

Space Wobble

Spacecraft find that Mars oscillates 10 centimeters off its axis of rotation.

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Point-of-care COVID-19 testing instrument Credit: Quidel

Rapid Tests

Researchers are developing a smorgasbord of tests to detect the virus that causes COVID-19.

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Photo of white-throated sparrow Credit: Scott M. Ramsay

Sparrow Tune

A variation on the white-throated sparrow’s song spread 3,300 kilometers in just a few decades.

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