NPR News Now covers the 4th of July celebrations in Washington, D.C., amid extreme heat, and reports on expanded joint naval drills between China and Russia. The episode also addresses the rising death toll from earthquakes in Venezuela and a legal battle over a slavery exhibit at George Washington’s former home. Additionally, it highlights the UK’s NHS adopting AI to reduce wait times and the FDA’s approval of CRISPR gene therapy for younger children with sickle cell disease.