Luca Bruno / AP

The distance runner Eliud Kipchoge completed the quickest marathon ever Saturday in two hours, 25 seconds under tightly-controlled conditions on a Formula One racetrack in Italy.

Nike project: Kipchoge's remarkable run was the showcase of Nike's big Breaking2 initiative, a multi-year, science-driven project to break the two-hour marathon barrier. (Getting under two hours would require a runner to average 4 minutes, 34 seconds per mile for the 26.2 mile distance.)

One level deeper: The athletes wore customized Nike shoes with a carbon-fiber plate that have attracted some controversy, per NYT, even though shoe design rules for standard marathons are vague.

Why it matters: Breaking2 has been a major effort by Nike to push the boundaries of running performance, while interest in the project and Nike's careful rollout has been a significant marketing opportunity for the retail giant.

One big question: Whether and when the otherworldly Kipchoge can break the world record under sanctioned conditions, and how fast he can go while still in his prime (he's 32). September's Berlin marathon, where the last several men's world records have been set, would be a logical place.

What they're saying: Sports scientist Ross Tucker predicts that Kipchoge could run around two hours and two minutes or slightly slower in a race like Berlin.

Why it's not a world record: Kipchoge ran 2 minutes and 32 seconds faster than the current world record, set by fellow Kenyan Dennis Kimetto in Berlin in 2014. But the sophisticated use of a rotating squad of pacemakers and mobile delivery of drink bottles during the event were outside the rules for record-sanctioned events.

Corporate battle: Nike is releasing a retail version of its Vaporfly shoe in June, while rival Adidas has a competing project called Sub2 and a competing shoe. Bloomberg breaks down the corporate rivalry here.

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Illustration: Sarah Grillo/Axios

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What they're saying: Trump nominates Amy Coney Barrett for Supreme Court

Judge Amy Coney Barrett in the Rose Garden of the White House on Sept. 26. Photo: Oliver Douliery/AFP via Getty Images

Democratic and Republican lawmakers along with other leading political figures reacted to President Trump's Saturday afternoon nomination of federal appeals court Judge Amy Coney Barrett to succeed Justice Ruth Bader Ginsburg on the Supreme Court.

What they're saying: "President Trump could not have made a better decision," Senate Majority Leader Mitch McConnell said in a statement. "Judge Amy Coney Barrett is an exceptionally impressive jurist and an exceedingly well-qualified nominee to the Supreme Court of the United States."

Amy Coney Barrett: "Should I be confirmed, I will be mindful of who came before me"

Trump introduces Amy Coney Barrett as nominee to replace Ruth Bader Ginsburg. Photo: Olivier Douleiry/Getty Images

In speaking after President Trump announced her as the Supreme Court nominee to replaced Ruth Bader Ginsburg, Circuit Court Judge Amy Coney Barrett said on Saturday she will be "mindful" of those who came before her on the court if confirmed.

What she's saying: Barrett touched on Ginsburg's legacy, as well as her own judicial philosophy and family values. "I love the United States and I love the United States Constitution," she said. "I'm truly humbled at the prospect of serving on the  Supreme Court."