Part 1 in a series on the future of nuclear power.

____

Future? In Massachusetts, nuclear power is history.

Last spring, Massachusetts’ last nuclear power plant — Pilgrim Nuclear Power Station — shut down after nearly 50 years. Repairing the aging plant was too expensive, and it couldn’t compete against cheap natural gas.

Updated at 2:31 p.m. ET

President Trump has named Robert C. O'Brien, who has been his special envoy for hostage affairs, to be his new national security adviser.

Trump made the announcement in a Wednesday morning tweet.

"I am pleased to announce that I will name Robert C. O'Brien, currently serving as the very successful Special Presidential Envoy for Hostage Affairs at the State Department, as our new National Security Advisor. I have worked long & hard with Robert. He will do a great job!" Trump said.

An outbreak of severe lung disease among users of electronic cigarettes continues to spread to new patients and states, and public health officials say it's too soon to point to a cause.

According to the latest report from the Centers for Disease Control and Prevention, a total of 380 confirmed and probable cases have been identified in 36 states and the U.S. Virgin Islands. The CDC has confirmed six deaths, and a seventh death has been reported by public health officials in Tulare County, Calif.

In the first three months after getting his Dexcom continuous glucose monitor, Ric Peralta managed to reduce his average blood sugar level by three percentage points.

"It took me from not-very-well-managed blood sugar to something that was incredibly well managed," says Peralta, a 46-year-old optician in Whittier, Calif., who was diagnosed with Type 1 diabetes in 2008.