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A sea slug smaller than a sesame seed has turned up in Taiwan's coastal waters -- and it's so tiny and unusual that scientists realized they had discovered a completely new species. Named Thecacera sesama after its black-and-yellow "sesame-like" ...

New research suggests Earth's climate can swing wildly on surprisingly short timescales -- even during hot, ice-free greenhouse periods. By studying ancient sediments from the Late Cretaceous, scientists uncovered repeating climate shifts tied to ...

Humanity may already be living far beyond what Earth can sustainably support, according to a sweeping new study analyzing more than 200 years of population and environmental data. Researchers found that while population growth once fueled innovation ...

Scientists uncovered evidence that human blood cells may trace their origins back to single-celled ancestors that lived 700 million years ago. By rebuilding the evolutionary family tree of blood cells, the team revealed how today's immune system grew ...

Scientists have created a global "treasure map" for rare earth elements by uncovering where the strange volcanic rocks that contain them are most likely to form. By combining thousands of rock samples with seismic images of Earth's deep interior, the ...

When a queen wasp suddenly disappears, her colony doesn't calmly choose a successor -- it erupts into chaos. Researchers found that female wasps immediately begin battling for power, shattering the colony's social order in a frenzy of aggression. But ...

A sweeping new study of wild snakes in the southeastern US has revealed a hidden health crisis slithering beneath the surface. Researchers found that many snakes are carrying multiple infections at once, with a dangerous fungal disease called ...

Hidden deep in the towering mountains of the Himalayas, one of Asia's most mysterious venomous snakes has been keeping a major secret for over 160 years. Scientists have now discovered that the so-called Himalayan pit viper is not just one species, . ...

Scientists have peered inside the skull of a 380-million-year-old Antarctic fish that was closely related to the first animals to walk on land, revealing surprising clues about how life began its move out of the water. Using advanced neutron imaging, ...

Deep inside 100-million-year-old amber from Myanmar, scientists uncovered a bizarre ancient bug with clawed front legs that look more like a crab's pincers than anything seen in modern insects. The discovery is so unusual that researchers say these . ...