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Juventus' Portuguese forward Cristiano Ronaldo celebrates after scoring his third goal during the Italian Serie A football match Cagliari vs Juventus on March 14, 2021 at the Sardegna Arena in Cagliari. (Photo by Alberto PIZZOLI / AFP) (Photo by ALBERTO PIZZOLI/AFP via Getty Images)

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Indian railway worker saves child from oncoming train

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This scanning electron microscope image shows SARS-CoV-2 (orange)—also known as 2019-nCoV, the virus that causes COVID-19—isolated from a patient in the U.S., emerging from the surface of cells (green) cultured in the lab. Credit: NIAID-RML

The latest on the coronavirus pandemic and vaccines

NASA's Ingenuity Mars Helicopter took this shot while hovering over the Martian surface on April 19, 2021, during the first instance of powered, controlled flight on another planet. It used its navigation camera, which autonomously tracks the ground during flight.

NASA's Mars helicopter Ingenuity successfully completed its historic first flight

CDC releases illustration of the Coronavirus.

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A split of Alexey Navalny and Vladimir Milov, one of his advisers.

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This scanning electron microscope image shows SARS-CoV-2 (orange)—also known as 2019-nCoV, the virus that causes COVID-19—isolated from a patient in the U.S., emerging from the surface of cells (green) cultured in the lab. Credit: NIAID-RML

April 18 coronavirus news

NASA's Ingenuity helicopter unlocked its blades, allowing them to spin freely, on April 7, 2021, the 47th Martian day, or sol, of the mission. This image was captured by the Mastcam-Z imager aboard NASA's Perseverance Mars rover on the following sol, April 8, 2021.

Mars helicopter's first flight could happen on Monday

President Joe Biden speaks about Russia in the East Room of the White House in Washington on April 15.

Joe Biden is meeting the cold reality of office

Firefighters battle flames in South African national park

This composite image looking toward the higher regions of Mount Sharp was taken on September 9, 2015, by NASA's Curiosity rover. In the foreground -- about 2 miles (3 kilometers) from the rover -- is a long ridge teeming with hematite, an iron oxide. Just beyond is an undulating plain rich in clay minerals. And just beyond that are a multitude of rounded buttes, all high in sulfate minerals. The changing mineralogy in these layers of Mount Sharp suggests a changing environment in early Mars, though all involve exposure to water billions of years ago. The Curiosity team hopes to be able to explore these diverse areas in the months and years ahead. Further back in the image are striking, light-toned cliffs in rock that may have formed in drier times and now is heavily eroded by winds.

The colors are adjusted so that rocks look approximately as they would if they were on Earth, to help geologists interpret the rocks. This "white balancing" to adjust for the lighting on Mars overly compensates for the absence of blue on Mars, making the sky appear light blue and sometimes giving dark, black rocks a blue cast.

Malin Space Science Systems, San Diego, built and operates Curiosity's Mastcam. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology, Pasadena, built the rover and manages the project for NASA's Science Mission Directorate, Washington. For more information about Curiosity, visit http://www.nasa.gov/msl and http://mars.nasa.gov/msl.

More information about Curiosity is online at http://www.nasa.gov/msl and http://mars.nasa.gov/msl/.

Credit
NASA/JPL-Caltech/MSSS

Mars didn't lose all of its water at once, based on Curiosity rover find

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Migrant workers gather in Hong Kong to call for better working conditions for both local and migrant workers.

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Head intensivist Dr. Ali Ghafouri, second left, meets with his health-care team doing his morning patient rounds in the intensive care unit at the Humber River Hospital during the COVID-19 pandemic in Toronto on Tuesday, April 13, 2021. A majority of the rooms are taken up by COVID-19 patients. (Nathan Denette/The Canadian Press via AP)