When asked to think of a chemical reaction, you might picture bubbling liquids in a beaker, or maybe applying heat to a mixture until something transforms. But some of the most important reactions ...

Some residents near a chemical leak at GFS Chemicals in Franklinton that prompted a shelter-in-place order on July 14 expressed concern and fear, while others were unfazed or unaware.

The use of prohibited chemical weapons by the Russian military had become "standardized and commonplace" in Ukraine, Dutch and German intelligence services found.