The study by the National Academies of Sciences comes after dozens of U.S. diplomats in Cuba and China complained of migraines, dizziness and memory loss.
Seventy years on, war participants are drawing starkly differing conclusions from the Battle of Chosin Reservoir. The decisive conflict's lasting legacy is still visible on the Korean Peninsula.
The new rules reduce the maximum validity of U.S. business and tourist visas held by party members and their families from 10 years to one month. China calls the action part of a "Cold War mentality."
Delivery workers in Beijing tell NPR they work 12-hour days, six days a week, monitored by apps tracking how and when they deliver hundreds of packages every day. One misstep and their pay is slashed.
The intellectual heart of China's Muslim community is under threat as scholars, writers, religious leaders and their families are under constant state surveillance.
What it means for the U.S. to be on the sidelines of another major trade agreement, the Regional Comprehensive Economic Partnership, which 15 countries agreed to Sunday.