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Human fetal tissue (stock photo) Ed Reschke/Getty Images hide caption
To cut carbon emissions, President Biden announced an initiative to further cut the cost of solar installations, like this one being tested at the National Renewable Energy Laboratory in Colorado. Dennis Schroeder/NREL hide caption
A 1930 tidal chart from the village of Bowling on the Firth of Clyde Andrew Matthews hide caption
An ash plume rises over La Soufriere on St. Vincent on April 13. The volcano is expected to continue erupting and has caused a humanitarian crisis. Orvil Samuel/AP hide caption
Using fluorescent antibody-based stains and advanced microscopy, researchers are able to visualize cells of different species origins in an early stage chimeric embryo. The red color indicates the cells of human origin. Weizhi Ji/Kunming University of Science and Technology hide caption
Cars sit on the edge of a sinkhole in the Charles Village neighborhood of Baltimore, Wednesday, April 30, 2014, as heavy rain moves through the region. Roads closed due to flooding, downed trees and electrical lines elsewhere in the Mid-Atlantic. AP hide caption
Dr. Anike Baptiste receives a dose of J&J from nurse Mokgadi Malebye at a Pretoria hospital last February. South Africa is one of the countries that announced a pause on the J&J vaccine while more research is done into potential blood clots that occurred in younger women after getting the vaccine. Phill Magakoe/AFP via Getty Images hide caption
Earth's atmosphere photographed from the International Space Station. Greenhouse gases have accumulated rapidly and are trapping extra heat in the atmosphere. It will take decades for the gases to break down naturally or be reabsorbed on Earth's surface. Expedition 28 Crew/International Space Station/NASA hide caption
Jeff Zients, the White House COVID-19 response coordinator, and Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, brief reporters in the Brady Press Briefing Room at the White House on Tuesday after two government agencies recommended a pause in the distribution of Johnson & Johnson's single-dose COVID-19 vaccine. Chip Somodevilla/Getty Images hide caption
The J & J Pause, Explained — And What It Means For The U.S. Vaccination Effort
Tim Cook, chief executive officer of Apple Inc., speaks during an event in 2018. Apple is one of 310 companies calling on the Biden administration to slash carbon emissions. David Paul Morris/Bloomberg via Getty Images hide caption
Men take a holy dip in the Ganges River on the occasion of first royal bath of Shivratri festival during Maha Kumbh Festival in Haridwar, India. Ritesh Shukla/NurPhoto via Getty Images hide caption
A mass vaccination site at the Lumen Field Event Center in Seattle had plenty of takers for the COVID-19 vaccine when it opened in mid-March. Though some relatively rare cases of coronavirus infection have been documented despite vaccination, "I don't see anything that changes our concept of the vaccine and its efficacy," says Dr. Anthony Fauci of the National Institutes of Health. Jason Redmond/AFP via Getty Images hide caption
CDC Studies 'Breakthrough' COVID Cases Among People Already Vaccinated
The National Weather Service Tampa Bay said its Geostationary Lightning Mapper captured the bright meteor that shocked Floridians late Monday as it burned up off the coast. The National Weather Service Tampa Bay hide caption
A portion of Australia's Great Barrier Reef. The Flinders Reef area of the Great Barrier Reef is one of 11 sites around the world where scientists are looking for decisive geological evidence of a new epoch called the Anthropocene. Grant Faint/Getty Images hide caption
Dr. Hassan Bencheqroun, an interventional pulmonary and critical care physician, has seen firsthand the impact of COVID-19 on Arab communities in the San Diego area. Hassan Bencheqroun hide caption
An artist's impression of the Cretaceous Period meat-eating dinosaur Llukalkan aliocranianus that lived about 80 million years ago in the Patagonia region of Argentina is seen in this handout photo. Jorge Blanco/Journal of Vertebrate Paleontology via Reuters hide caption
A scientist works on COVID-19 samples to find variations of the virus at the Croix-Rousse Hospital laboratory in Lyon, France, in January. Jeff Pachoud/AFP via Getty Images hide caption
A satellite image from September 2017 shows Hurricane Irma, left, and Hurricane Jose, right, in the Atlantic Ocean. NOAA says the average annual number of tropical storms in the Atlantic has slightly increased. NOAA/GOES-16/AP hide caption