It was important to read the recent letters that revisited the dangers associated with the use of sodium azide (C&EN Jan. 11, page 4; April 5, page 5; and Nov. 9, 2009, page 8). None of these letters, ...

Starting next week, every home in the United States will be able to order four more free at-home COVID-19 tests from the federal government. Since the start of the coronavirus pandemic, public health ...