Overflowing crater lakes carved canyons across Mars

Today, most of the water on Mars is locked away in frozen ice caps. But billions of years ago it flowed freely across the surface, forming rushing rivers that emptied into craters, forming lakes and seas. New research led ...

Brazilian Amazon deforestation hits new Jan-Apr high

Deforestation in the Brazilian Amazon hit a new high in the first four months of the year, according to data released Friday, a worrying trend after the devastation caused by record fires last year.

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