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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.

Go deeper

33 mins ago - Health

Pfizer says COVID vaccine over 90% effective in kids

A health care worker preparing a Pfizer-BioNTech coronavirus vaccine dose in New York City on Oct. 21. Photo: Michael M. Santiago/Getty Images

Pfizer and BioNTech said their COVID-19 vaccine was more than 90% effective at protecting children between the ages of 5 and 11 from symptomatic infections from the virus, according to a study posted online by the Food and Drug Administration Friday.

Why it matters: Pfizer is seeking an emergency use authorization to vaccinate children — one of the last groups of Americans still largely ineligible to receive a coronavirus vaccine.

Changing the inflation conversation

Illustration: Annelise Capossela/Axios

Inflation looks like it’ll run hot for longer than plenty of smart people thought it would. The conversation over just how much more Americans will have to pay for their stuff has taken on a new intensity, as supply problems show few signs of fading.

Why it matters: The rate of price growth has remained consistently strong in recent months — a time that some thought would bring cooling prices after an initial reopening spike. What goes on with prices will influence the decisions made by Congress, the Biden Administration, and the Federal Reserve.

The biggest headline from Biden's town hall

President Biden greets attendees during a commercial break in Baltimore last night. Photo: Nicholas Kamm/AFP via Getty Images

What matters from President Biden's town hall with CNN's Anderson Cooper at Baltimore Center Stage on Thursday:

The biggest headline: Biden is jettisoning the corporate tax increases that White House officials have insisted, for the past 10 months, are wildly popular across the country. He admitted he doesn't have the votes.