 Live from NPR News in Washington on Corva Coleman, the Biden administration is proposing new federal rules intended to protect millions of people exposed to extreme heat on the job. NPR's Jeff Brady reports. Under the proposed rules, employers will have to develop plans that include rest breaks and access to shade and water. The Occupational Safety and Health Administration rules cover about 35 million workers who routinely experience heat indexes of 80 degrees Fahrenheit and above.