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A look back at the biggest science stories of 2025, and a few you may have missed. Plus, over the past year, most of your body has replaced itself cell by cell. What can we learn from other animals’ ...

Scientists found that certain molecules made by gut bacteria travel to the liver and help control how the body uses energy. These molecules change depending on diet, genetics, and shifts in the ...

The Roman sage Marcus Aurelius said we should never let the future disturb us. But then he never had a conversation with the futurologist Nick Bostrom about the state of the world in 2050. “There’s a ...