Vietnam locks down Ho Chi Minh City amid new variant concerns.

New questions are being raised as to whether COVID-19 vaccines can keep up with newly emerging variants.

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Simone Biles withdraws from another Olympic gymnastics final.

Simone Biles withdraws from another Olympic gymnastics final.

The gymnast heralded as the “greatest of all time” announced she would not compete in the individual all-around final. ABC News Live Update, Weekdays at 9 AM & 11AM EST WATCH the ABC News Live Stream: SUBSCRIBE to ABC News: Watch More on LIKE ABC ...

Hurricanes explained by Ginger Zee

Hurricanes explained by Ginger Zee

ABC News Chief Meteorologist Ginger Zee explains how hurricanes form, why they’re dangerous and how they’re affected by climate change.

CDC says everyone in areas where COVID-19 is quickly spreading should wear a mask indoors - ABC News.

CDC says everyone in areas where COVID-19 is quickly spreading should wear a mask indoors - ABC News.

In a major reversal, the CDC now says everyone in areas where COVID-19 is quickly spreading should wear a mask indoors. Plus, newly released body camera video shows an Aurora, Colorado police officer using his pistol to beat a man during an arrest...

Reptile couple meets for 1st time on FaceTime

Reptile couple meets for 1st time on FaceTime

70-year-old Hugo and 21-year-old Estrella are a Galapagos tortoise match made in heaven! ABC News' Will Ganss has the details.

Simone Biles' exit shines light on mental health

Simone Biles' exit shines light on mental health

Fellow Olympians are rallying around her decision to bow out of events to focus on her mental health. ABC News' Will Ganss reports.