Wisdom, a Laysan albatross that's believed to be 65 years old, and her mate have welcomed a new chick at the Midway Atoll National Wildlife Refuge. Here, a week-old chick peeks out from its nest. Kaipo Kiaha/Paliku Productions hide caption

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A lab worker exposes his arm to Aedes Aegypti mosquitoes, responsible for the spread of the Zika virus, during testing in the epidemiology lab at the Roosevelt Hospital in Guatemala City, Guatemala, on Feb. 1, 2016. Saul Martinez/Bloomberg via Getty Images hide caption

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A central piece of President Obama's climate change initiatives is now on hold, after the Supreme Court put a stay on rules limiting carbon pollution generated by U.S. power plants. Charlie Riedel/AP hide caption

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Ferguson mayor James Knowles III, (second from left) speaks during a city council meeting on Feb. 2. The meeting was the first opportunity for residents to speak directly with city leaders about the preliminary consent agreement with the U.S. Department of Justice. Jeff Roberson/AP hide caption

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NASA Administrator Charles Bolden speaks at a panel discussion on the search for life beyond Earth at NASA Headquarters in 2014. Joel Kowsky/NASA hide caption

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