Science

The 3D structure of a base editor, consisting of the Cas9 protein (white and gray), which binds to a DNA target (teal and blue helix) complementary to the guide RNA (purple), and protein deaminases ( red and pink), which change one nucleotide for another. Credit: UC Berkeley, image by Gavin …

Astronauts Bob Behnken and Doug Hurley were tied to Crew Dragon before the May 27 launch. SpaceX The SpaceX Crew Dragon Demo-2 mission so far has been easy for NASA Commercial Crew Program. Astronauts Bob Behnken and Doug Hurley had a successful launch and trip to the International Space Station …

But the president’s tweet was another sign of democratic backsliding, a term used in political science to describe the erosion of institutions that support democracy. His unfounded tweets about mail ballots and other issues have cast doubt on the legitimacy of this fall’s election and have been widely criticized. Their …

Brazilian First Lady Michelle Bolsonaro tested positive for COVID-19 weeks after her husband, President Jair Bolsonaro, announced that he had done the same. She is in “good health” and follows established health protocols, according to a statement on Wednesday. Michelle Bolsonaro is being monitored by a presidential medical team. The …

The company behind the “most advanced” coronavirus vaccine in development said it could produce 100 million doses by the end of the year and up to 1.3 billion by 2021 at a key facility here in Massachusetts. “As we continue to fight this virus, against COVID-19, a vaccine and treatment …