Presidential candidate Joe Biden squared off with a voter in Iowa on Thursday, calling the man a "damn liar" after he accused Biden of helping to get his son on the board of a Ukrainian gas company in an attempt to win access with Ukraine's president.

In the testy exchange at a town hall packed with Biden supporters, the former vice president took umbrage with another accusation from the voter: that Biden is too old to run for president.

Updated 4:55 p.m. ET

Members of the United Auto Workers executive board Thursday approved Rory Gamble as president of the union through June 2022.

He was elevated from his acting role and will serve the rest of the term vacated by former president Gary Jones, who resigned last month after being implicated in a years-long federal investigation looking into embezzlement and bribery at the union.

General Motors and LG Chemical plan to make battery cells for electric-powered vehicles, unveiling a joint venture that they expect to create more than 1,100 jobs in northeast Ohio. The companies say they'll invest up to $2.3 billion in the venture.

The project is centered around Lordstown, Ohio, where GM shuttered a plant last March that had produced the Chevrolet Cruze. The new plant in the Lordstown area will make battery cells for GM's upcoming all-electric vehicles, from a Cadillac sedan to a new electric truck that's slated for release in late 2021.

The Trump Administration has named its choice to lead the federal office on homelessness: Robert Marbut, a well-known consultant to cities trying to tackle the issue.

Lawmakers are calling for an investigation into a troubled student loan discharge program one day after an NPR report revealed that the program — meant to erase the student debts of borrowers with significant, permanent disabilities — wasn't helping the vast majority of those who are eligible.

A comet from another star will swing by our sun Dec. 8.

Known as 2I/Borisov, it is the first comet to ever be seen coming from interstellar space. But despite its alien origins, astronomers say it actually looks pretty familiar.

"Borisov is a comet very like what we have in our own solar system," says Michele Bannister, a planetary astronomer at Queen's University Belfast told NPR's Short Wave. Whatever planetary system it formed in, "it's a lot like our own."

A new Gilded Age has emerged in America — a 21st century version.

The wealth of the top 1% of Americans has grown dramatically in the past four decades, squeezing both the middle class and the poor. This is in sharp contrast to Europe and Asia, where the wealth of the 1% has grown at a more constrained pace.

One of opera's leading men, Italian tenor Vittorio Grigolo, was dismissed Thursday by two of the world's most prestigious houses: the Royal Opera in London and New York's Metropolitan Opera.

His firing comes after an investigation by the Royal Opera [RO], which determined that he had demonstrated "inappropriate and aggressive behavior" during an RO tour of Japan in September.

Scientists know that if they transfuse blood from a young mouse to an old one, then they can stave off or even reverse some signs of aging. But they don't know what in the blood is responsible for this remarkable effect.

Researchers now report that they've identified hundreds of proteins in human blood that wax and wane in surprising ways as we age. The findings could provide important clues about which substances in the blood can slow aging.