The concept of herd immunity is at the heart of global vaccination efforts and discussions about next steps in fighting the Covid-19 pandemic and bringing back economies. For the pandemic to stop, the coronavirus has to run out of susceptible hosts to infect. Herd immunity occurs when enough people in a population develop an immune…

A federal court granted a preliminary injunction halting the Trump administration’s planned ban of Chinese app WeChat, in response to a plaintiff lawsuit saying the ban would harm their First Amendment rights.The United States District Court in San Francisco said the plaintiffs, a group of WeChat users, had shown there are “serious questions” related to…

Washington (CNN)Former President Bill Clinton said Sunday it is "superficially hypocritical" for President Donald Trump and Senate Republicans to push to put a new justice on the Supreme Court before…

Sen. Tom Cotton said on "Fox News Sunday" that the Senate "will move forward without delay" in confirming a new Supreme Court justice to the seat of late justice and women's rights pioneer Ruth Bader Ginsburg -- as Senate Judiciary Committee member Sen. Chris Coons said Republicans are being hypocritical by moving to advance a nominee."My condolences to Justice Ginsburg's family…

Show captionPeople gather to pay respects to Ruth Bader Ginsburg in front of the supreme court in Washington. Photograph: REX/ShutterstockRuth Bader GinsburgOn a pavement across the street from the supreme court, school teacher Amanda Stafford chalked the words carefully: “That’s the dissenter’s hope: that they are writing not for today, but for tomorrow.”It was a…