A powerful explosion rocked a chemical plant and set it on fire Monday outside the separatist stronghold of Donetsk in eastern Ukraine, where fierce fighting has surged despite a renewed diplomatic push for peace.

It took 16 years of twists and turns. Over and over, Dr. Nancy Sullivan thought she was close to an Ebola vaccine, only to see the next experiment fail.

The federal government on Monday pledged $3.2 million to help save the monarch butterfly, the iconic orange-and-black butterfly that can migrate thousands of miles between the U.S. and Mexico each year. In recent years, the species has experienced a 90 percent decline in population, with the lowest recorded population occurring in 2013-2014.

Insurers aren’t required to encrypt consumers’ data under a 1990s federal law that remains the foundation for health care privacy in the Internet age — an omission that seems striking in light of the major cyberattack against Anthem.

California has proposed closing by October up to 140 oilfield wells that state regulators had allowed to inject into federally protected drinking water aquifers, state officials said Monday.