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After some 10,000 online tutorials in 10 years, Sal Khan still starts most days at his office desk in Silicon Valley, recording himself solving math problems for his Khan Academy YouTube channel.

"OK, let F of X equal A times X to the N plus," he says cheerfully as he begins his latest.

Khan Academy has helped millions of people around the world — perhaps hundreds of millions — learn math, science and other subjects for free.

An unscheduled meeting between the U.S. attorney general and former President Bill Clinton at an airport in Phoenix on Monday could present some unwanted political problems for both.

The former president, who was waiting to depart the state, boarded Loretta Lynch's government aircraft shortly after she landed in Arizona for a community policing event. Lynch later told reporters there the conversation centered on "his grandchildren."

"It was primarily social and about our travels," including golf he played, Lynch said.

Swimming superstar Michael Phelps made history again Wednesday night. At the U.S. Olympic swimming trials in Omaha, Neb., Phelps qualified for a record fifth Olympic games. He's the first American male swimmer to do that.

But Phelps is one of the few veterans having success so far at the trials. That's because a batch of young, first-time Olympians is stealing the show.

Desperate calls from inside the Pulse nightclub; police strategizing and concerns; reports of wounded civilians: those are among the details held in records newly released by the Orange County Sheriff's Office about the June 12 mass shooting in Orlando, Florida.

The records, obtained by member station WLRN in Miami, also show that it took time for law enforcement to get a clear description of the suspect — and that there was concern that officers' shields would not protect them against rifle fire.

Turkish officials say Islamic State militants orchestrated the terrorist attack that killed 42 people and injured more than 230 at Istanbul's Ataturk Airport Tuesday.

ISIS has not claimed responsibility. The attack at the airport was the latest and one of the most deadly in a string of at least a dozen attacks in Turkey over the past year. Turkey has blamed most of these attacks on either Kurdish separatists or ISIS.

The global economy is "here" and "done," President Obama said Wednesday — the question now is under what terms it will be shaped.

Obama spoke at a news conference that was dominated by questions about global trade, the effects of Brexit, and Donald Trump. It followed a summit meeting with the leaders of Canada and Mexico in Ottawa.

Presumptive Republican presidential nominee Donald Trump traveled to the small city of Monessen, Pa., on Tuesday to speak about the impact of international trade on U.S. manufacturing jobs.

As he has before, Trump launched a full-throated attack on globalization, pinning the blame on politicians he says have allowed the U.S. manufacturing base to get hollowed out.

"We allowed foreign countries to subsidize their goods, devalue their currencies, violate their agreements and cheat in every way imaginable. And our politicians did nothing about it," he told the crowd.

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