The ‘window is rapidly closing’ to gather crucial evidence on the virus’s origins, scientists say.

Further delays could make it impossible to recover crucial evidence about the beginning of the pandemic, say experts studying the origins of the coronavirus for the World Health Organization.

The ‘window is rapidly closing’ to gather crucial evidence on the virus’s origins, scientists say.

Further delays could make it impossible to recover crucial evidence about the beginning of the pandemic, say experts studying the origins of the coronavirus for the World Health Organization.

These Could Be the Oldest Animal Fossils Ever Found, or Just Squiggles

Critics challenged a study’s claim that a netlike structure found in rocks in a Canadian mountain range could be an 890-million-year-old sponge fossil.

Delta Variant Widens Gulf Between ‘Two Americas’: Vaccinated and Unvaccinated

Data from overseas, particularly Britain, suggest the spread of the virus will set vaccinated and unvaccinated communities on very different paths.

Parts of the Amazon Go From Absorbing Carbon Dioxide to Emitting It

A new study analyzing hundreds of aerial readings of emissions above the forest canopy found that forest regions in the southeast were most affected.

Three Studies, One Result: Vaccines Point the Way Out of the Pandemic

New scientific research underscores the effectiveness of vaccines and their versatility in the fight against the coronavirus.

Pfizer and Moderna Vaccines Likely to Produce Lasting Immunity, Study Finds

Immune cells are still organizing to fight the coronavirus months after inoculation, scientists reported.

Against Expectations, Southwestern Summers Are Getting Even Drier

The finding by researchers runs counter to a basic tenet of climate change — that warming increases humidity because hotter air holds more moisture. It’s also bad news for fire seasons.

Immunity to the Coronavirus May Persist for Years, Scientists Find

Important immune cells survive in the bone marrow of people who were infected with the virus or were inoculated against it, new research suggests.

Scientists Drove Mice to Bond by Zapping Their Brains With Light

The study, a tour de force in bioengineering, comes after two decades of research on brain-to-brain synchrony in people.