It's a lesson you learn as early as grade school: If you find yourself injured, threatened or otherwise in harm's way, just break out your phone and dial a simple, three-digit number: 911. After more than five decades, the 911 emergency call system has become so memorable and ubiquitously known, it even has its own network TV adaptation.

But what if the danger is rooted less in the physical, and more in one's mental health?

As the impeachment inquiry against President Trump has unfolded, one name in particular has surfaced over and over again in both private hearing transcripts and public testimony: the president's personal lawyer, Rudolph Giuliani.

Congressional testimony has placed Giuliani at the center of the Ukraine affair, with multiple witnesses telling House investigators that he helped spearhead an irregular diplomatic channel between the U.S. and Ukraine.

Nearly 500 Oklahoma prison inmates walked free on Monday, Nov. 4, in an effort by the state to lose the title of the nation's incarceration capital. Oklahoma's incarceration rate in 2018 led the nation, with 1,079 per 100,000 people behind bars, according to a report by the Prison Policy Initiative.

Updated 10:40 a.m. ET

British voters delivered a stunning victory to Prime Minister Boris Johnson and his Conservative Party in Thursday's general election, giving the Brexit backer a large majority in the House of Commons and the support he needs to take the United Kingdom out of the European Union in January.

"The Conservatives picked up 47 seats," NPR's Frank Langfitt reports from London. "This is the biggest majority since Margaret Thatcher's win in 1987."