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Julio Cortez / AP

Going to the dentist can be a pain, but it was certainly much tougher 13,000 years ago when dental work could have started, according to a recent study published in the American Journal of Physical Anthropology.

The dental details: Italian researchers recently analyzed a pair of 13,000-year-old incisors (think: your front four teeth and the four opposite on the bottom row) that were discovered 20 years ago. The images of the incisors show large, hollowed pits in the teeth that had previously been filled, which indicates some dental work had been done. Although the exact filling composition is hard to discern now, the researchers found traces of bitumen, vegetable fibers and hair.

Why it matters: This research, although not the oldest finding of dental work, is the oldest example of the use of fillings. It indicates that even prehistoric humans were curious and concerned about dental health and began curative practices for cavities.

Go deeper

Justice Department drops insider trading inquiry against Sen. Richard Burr

Sen. Richard Burr (R-N.C.) walking through the Senate Subway in the U.S. Capitol in December 2020. Photo: Stefani Reynolds/Getty Images

The Department of Justice told Sen. Richard Burr (R-N.C.) on Tuesday that it will not move forward with insider trading charges against him.

Why it matters: The decision, first reported by the New York Times, effectively ends the DOJ's investigation into the senator's stock sell-off that occurred after multiple lawmakers were briefed about the coronavirus' potential economic toll. Burr subsequently stepped down as chair of the Senate Intelligence Committee.

Netflix tops 200 million global subscribers

Illustration: Rebecca Zisser/Axios

Netflix said that it added another 8.5 million global subscribers last quarter, bringing its total number of paid subscribers globally to more than 200 million.

The big picture: Positive fourth-quarter results show Netflix's resiliency, despite increased competition and pandemic-related production headwinds.

Janet Yellen plays down debt, tax hike concerns in confirmation hearing

Treasury Secretary nominee Janet Yellen at an event in December. Photo: Alex Wong via Getty Images

Janet Yellen, Biden's pick to lead the Treasury Department, pushed back against two key concerns from Republican senators at her confirmation hearing on Tuesday: the country's debt and the incoming administration's plans to eventually raise taxes.

Driving the news: Yellen — who's expected to win confirmation — said spending big now will prevent the U.S. from having to dig out of a deeper hole later. She also said the Biden administration's priority right now is coronavirus relief, not raising taxes.