Learn more about why the human population seems to be in decline and what that could mean for the future. 

Learn why some icy objects inhabiting a remote region beyond Neptune look like snowmen.

Learn how a simple blood test measuring a key Alzheimer’s protein may help estimate when symptoms are likely to begin, potentially reshaping prevention research.

NASA has classified the flawed Starliner crewed test flight in 2024 as its most serious level of mishap, with the agency’s leadership citing shortfalls in how officials oversaw the program.

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