After telling the House Financial Services Committee about the suicide of Robinhood user Alex Kearns, who died believing he had lost $730,000 on the brokerage app, Representative Sean Casten called its help line.

In a House Financial Services Committee hearing, Gabe Plotkin, founder and chief executive of the hedge fund Melvin Capital, defended his firm's long-term strategy in betting that GameStop shares would fall.

Keith Gill, known on YouTube as Roaring Kitty and on Reddit's Wall Street Bets forum as D.F.V., joked that he was 'not a cat' and defended his GameStop investment during a House Financial Services Committee hearing.

Vlad Tenev, the chief executive of Robinhood, apologized for temporarily limiting trading of GameStop after Jan. 28, but said his company did nothing wrong at a House Financial Services Committee hearing on GameStop.

In a meeting with women leaders, Vice President Kamala Harris said high numbers of women being pushed from the work force by the pandemic can be largely addressed by the Biden administration's coronavirus relief plan.

NASA's robotic explorer, Perseverance, will reach Mars on Thursday afternoon, and attempt a difficult landing.

On Thursday, the House Financial Services Committee is holding a virtual hearing on GameStop and Reddit. Witnesses will include the chief executive and co-founder of Reddit.

Several animal species have been threatened by record-low temperatures in Texas this week, including thousands of sea turtles that were rescued and brought to land.

Lawmakers debated a bill on Wednesday that would establish a commission to study the persisting impacts of slavery and develop a proposal for remedies.

Dr. Rochelle Walensky, the director of the C.D.C., said the agency was concerned about the transmission of new coronavirus variants and suggested that relying on U.S. vaccinations alone would not be effective.