The Download: the CDC’s vaccine chaos

Former CDC leaders raised concerns about the agency's turmoil and departure reasons during a Senate hearing. CDC advisers voted against recommending the MMRV vaccine for children under four, adding to the agency's challenges. The article also covers Russia's use of a murder case to sow division, Nvidia's investment in Intel, and potential biases in medical AI tools. Additional topics include AI browsers, China's brain interface race, and the excitement over Apple products in Beijing.