Scrutinizing SpaceX, NASA Overlooked Some Boeing Software Problems

The agency identified the causes of mishaps in orbit during an uncrewed test flight of its Starliner spacecraft in December.

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W.H.O. to Review Evidence of Airborne Transmission of Coronavirus

The World Health Organization plans to update its advice after hundreds of experts urged the agency to reconsider the risk of aerosol transmission.

12h

Intense Arctic Wildfires Set a Pollution Record

High temperatures and dry soil mean ideal conditions for fires. Blazes in June produced more carbon emissions than any other fires in almost two decades of monitoring.

14h

Patient Is Reported Free of H.I.V., but Scientists Urge Caution

Brazilian scientists say the man no longer shows signs of the infection after taking a powerful drug cocktail. But the preliminary results require confirmation.

19h

Live Coronavirus Updates: Testing Demand in U.S. Soars

Dr. Anthony Fauci said the country was “knee-deep in the first wave.” The U.S. will pay a company $1.6 billion for vaccine development.

23h

‘It Will Consume Your Life’: 4 Families Take On Rare Diseases

Confronted by illnesses that most scientists overlook, these families had to work out their own approaches to find treatments.

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Could You Make a Snowball of Neutrinos?

You’ll need more than a few — say, 300 decillion. And good luck trying to throw it.

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Airborne Coronavirus: What You Should Do Now

How to protect yourself from a virus that may be floating indoors? Better ventilation, for starters. And keep wearing those masks.

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356 Elephants Died Suddenly. The Cause Is a Mystery.

Some conservationists say the recent die-off in Botswana could be natural, but others expressed more concern.

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Spirit Bears' Hair Helps Reveal New Genetic Secrets

First Nations peoples along British Columbia’s Central Coast led research to help preserve the area’s white-furred Spirit bears.

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