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Their joint analysis, recently published in Nature, offers the most accurate measurements yet of how neutrinos change from one type to another as they travel through space.

"While interactions between stem cells and their neighboring cells influence how a stem cell reacts immediately, distant interactions may control how that same stem cell responds to big changes in an organism."

TOKYO—The Bank of Japan left its policy rate steady again on Thursday, waiting for clarity on the impact of tariffs and a political leadership change in Tokyo.

The study found an association between gum disease and these brain changes, though it does not prove that one causes the other.

Their personal reasons weren't always about climate change -- one cared about air pollution, another about animal cruelty -- but their efforts are helping to bring down planet-warming emissions all the same, showing how environmental causes overlap.