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WASHINGTON — Former mayor of New York City Michael Bloomberg launched a video ad Sunday to formally announce his campaign for president in the 2020 US election.

WASHINGTON, Oct. 11 -- Researchers at Stanford University developed a new gene-editing technology to manipulate the genome in three-dimensional space, and found that genes behaved differently in different zones.

Walmart, the world's biggest retailer, announced on Tuesday that it will stop selling ammunition for assault-style rifles and handguns, one month after a gunman walked into an El Paso, Texas, Walmart with an AK-style semiautomatic rifle and killed 22 people.

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Wang Jian, chairman of the technology committee of Alibaba, said the system, covering 420 square kilometers of the downtown area, is accessible to urban managers and public security and tourism authorities to help them respond to emergencies and promptly handle problems.

WASHINGTON — A strong majority, 74 percent, of US business economists appear sufficiently concerned about the risks of some of President Donald Trump's economic policies that they expect a recession in the US by the end of 2021.

WASHINGTON/NEW YORK - The United States and Canada closed their shared border to "non-essential traffic" on Wednesday as US President Donald Trump moved to hasten medical equipment production and said hospital ships would be deployed in the battle against the coronavirus.

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Wang Han, a senior host with HBS, interacts with a guest on

WASHINGTON - US Senator Amy Klobuchar of Minnesota announced Thursday night that she is withdrawing from consideration to be former US Vice-President Joe Biden's running mate.

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WASHINGTON — Freshman Rep. Katie Hill, a rising Democratic star in the House, announced her resignation amid an ethics probe, saying explicit private photos of her with a campaign staffer had been "weaponized" by her husband and political operatives.

WHAKATANE, New Zealand - Eight people were missing and presumed dead on Tuesday after a volcanic eruption covered a small New Zealand island popular with tourists in hot ash and steam, killing five people and seriously injuring around 30 more.