Memos signed by Secretary of Homeland Security John Kelly, seen at a news conference earlier this month at the San Ysidro Port of Entry in San Diego, lay out a number of immigration-enforcement measures, such as expedited deportation proceedings for unauthorized immigrants who have been in the U.S. illegally for up to two years. Denis Poroy/AP hide caption

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Adults and children return to St. Louis Jewish Community Center on Jan. 18, in St. Louis, Mo., after canine units cleared the building. According to St. Louis County Police, someone called the front desk claiming a device was inside. Laurie Skrivan/St. Louis Post-Dispatch via AP hide caption

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Laurie Skrivan/St. Louis Post-Dispatch via AP

An artist's concept shows the WISE spacecraft in its orbit around Earth. NASA/JPL-Caltech hide caption

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NASA/JPL-Caltech

Have Spare Time? Try To Discover A Planet

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President Trump speaks during his campaign-style rally at Orlando Melbourne International Airport in Florida on Saturday. Joe Raedle/Getty Images hide caption

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Trump Says, 'Look What's Happening In Sweden.' Sweden Asks, 'Wait, What?'

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Spain's Princess Cristina and her husband, former Olympic handball player Inaki Urdangarin, leave the courtroom last year after a hearing in a landmark corruption trial on the Spanish Balearic island of Mallorca. Jaime Reina/AFP/Getty Images hide caption

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Martin Shkreli, seen here leaving court in New York City last June, faced protests and a false fire alarm during an event Wednesday at Harvard. Drew Angerer/Getty Images hide caption

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Then-Fox News chairman Roger Ailes with his wife Elizabeth Tilson in 2016. A New York attorney alleges Fox faces a federal probe related to sexual harassment of company employees by Ailes. Drew Angerer/Getty Images hide caption

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This is the actual NASA graphic illustrating the "Space Poop Challenge." NASA hide caption

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NASA

Space Poop Problem-Solvers Take Home Cash Prizes From NASA

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Malaysian police officers stand outside Putrajaya Hospital, outside Kuala Lumpur, where the body of Kim Jong Un's brother was initially brought. STR/AFP/Getty Images hide caption

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Second Suspect Arrested In Death Of N. Korean Dictator's Half-Brother

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President Trump says news reports about contacts between his team and Russia's intelligence agencies are the result of conspiracy theories. Trump is seen here at the White House on Tuesday. Mark Wilson/Getty Images hide caption

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Reports: U.S. Intercepted Calls Between Trump Campaign Staff And Russian Intelligence

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Pullman, author of the His Dark Materials trilogy, holds a copy of its concluding volume, The Amber Spyglass. The first book of a new series will be published in Fall 2017. Max Nash/Associated Press hide caption

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Max Nash/Associated Press

Author Philip Pullman Announces A Follow-Up Trilogy To 'His Dark Materials'

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Tiny minerals in the clay of this jar hold information about the strength of the Earth's magnetic field at the time the jar was fired, thousands of years ago. Image courtesy of Oded Lipschits hide caption

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Image courtesy of Oded Lipschits

The Oroville Dam's main spillway as seen on Feb. 14. Crews working round the clock since Sunday have made progress stabilizing this and another spillway damaged by water. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

Philip Pullman To Follow-Up 'His Dark Materials' Trilogy

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An Airbus A350-900 for Qatar Airways in 2014 in France. Qatar Airways is among the airlines that have announced they will resume boarding travelers affected by President Trump's executive order. Eric Cabanis/AFP/Getty Images hide caption

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An aerial photo released Saturday by the California Department of Water Resources shows the damaged spillway with eroded hillside in Oroville, Calif. William Croyle/California Department of Water Resources via AP hide caption

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William Croyle/California Department of Water Resources via AP

Signs Of Hope At Oroville Dam, After Overflow Sparked Large Evacuation Sunday

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