Uber has grounded its self-driving cars in Arizona while it continues to investigate an accident that happened on Friday evening in Tempe. The company also confirmed that the car was in self-driving mode when another car hit it.

While it had a safety driver in the driver's seat (as all its self-driving cars do), there were no passengers in the back, and no serious injuries to anyone in either car, according to Uber.

What to watch: The results of the investigation could raise questions about Uber's self-driving car software if its car was at fault or should have avoided the collision.

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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.
Bryan Walsh, author of Future
1 hour ago - Health

America's poor health is jeopardizing its future

Illustration: Eniola Odetunde/Axios

From high levels of obesity and opioid addiction to inequities in access to care, America's pre-existing conditions make the country an easy target for COVID-19, as well as future pandemics that could cripple the United States for decades to come.

Why it matters: One of the best ways the country could prepare for future threats — and boost its economy — is to improve Americans' overall health.