evidence: The Supreme Court delivered 2 decisions on vaccine rules for U.S. workers [...] Ten million health care workers across the U.S. legally have to abide by the Biden administration's vaccine mandate. The Supreme Court upheld that rule yesterday. At the same time, the court blocked the vaccine-or-test rule that had been set for 84 million workers at companies. NPR's Andrea Hsu is here with details. Andrea, what did the court have to say? ANDREA HSU, BYLINE: Well, on the vaccine-or-test rule, the vote was 6 to 3 to block it. The six conservative justices found that OSHA, the federal workplace safety agency, did not have the authority to issue something so sweeping. They sided with the challengers, who had argued that COVID is not a danger specific to the workplace; it's all over society. And the court said OSHA can regulate occupational hazards but not public health more broadly without clear authorization from Congress. Now, the three liberal justices said the court's decision hinders the federal government's ability to deal with the very serious threat that the virus still poses to workers.