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The six strains of SARS-CoV-2

The virus causing the COVID-19 pandemic, SARS-CoV-2, presents at least six strains. Despite its mutations, the virus shows little variability, and this is good news for the researchers working on a viable vaccine.

Mexico cave with evidence of early humans closed to visitors

Tourists or locals visiting a cave in north-central Mexico could endanger what is purported to be some of the earliest evidence of human presence in North America, archaeological authorities said Thursday.

Migratory river fish populations down 76% since 1970

Populations of migratory river fish collapsed by 76 percent on average in the last 50 years, according to a report by conservation groups Tuesday, warning the "catastrophic" declines could impact people and ecosystems around ...

2,000 years of storms in the Caribbean

The hurricanes in the Caribbean became more frequent and their force varied noticeably around the same time that classical Mayan culture in Central America suffered its final demise: We can gain these and other insights by ...

Arizona rock core sheds light on triassic dark ages

A rock core from Petrified Forest National Park, Arizona, has given scientists a powerful new tool to understand how catastrophic events shaped Earth's ecosystems before the rise of the dinosaurs.

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