European Center for Nuclear Research (CERN) scientists. Photo: Fabrice Coffrini / AP

Nuclear physicists have found that the proton is four percent smaller than what was originally believed, according to a study published in Science, reports Davide Castelvecchi for Nature. In 2010 researchers studying a type of lab-created muonic hydrogen found the protons were 4% smaller than previously estimated. Some thought the lab-created hydrogen had heavier protons due to a previously undiscovered type of physics, but this study, which found similar results in regular hydrogen, suggests that the earlier measurements were incorrect and no physics needs to be rewritten.

Why it matters: This backs up a previous finding that "has made physicists doubt their most precise measurements, and even their most cherished theories," writes Castelvecchi.

But, but, but: The physicists are "not quite ready to claim that the puzzle has been solved," Nature reports. It's possible past measurements with large protons were correct, so they study authors are waiting for results from other experiments. Science News writes that different techniques are coming up with different results.

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SurveyMonkey poll: Trump improves, but not enough

Trump and Biden during the final debate. Photo: Xinhua/Liu Jie via Getty Images

President Trump's final debate performance exceeded Americans' expectations, but it wasn't enough to shift the dynamics that left him trailing Joe Biden across most measures, according to a new Axios-SurveyMonkey poll.

What they're saying: "Liar" was the word used most by debate watchers to describe Trump's performance, followed by "lies," "strong," "presidential" and "childish." "Presidential" was the word used most to describe Biden's performance, followed by "liar," "weak," "expected" and "honest."

Hunter Biden saga dominates online debate

Data: NewsWhip; Table: Axios Visuals

The mainstream media turned away. But online, President Trump's charges about Hunter Biden were by far the dominant storyline about the final presidential debate, according to exclusive NewsWhip data provided to Axios.

  • Coverage of business dealings by Joe Biden's son — and pre-debate allegations by one of his former business associates, Tony Bobulinski — garnered more than twice as much online activity (likes, comments, shares) as the runner-up.

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