IN Prof. Runge's article on the spectra of the elements in last week's issue of NATURE (p. 607) he refers to my explanation of double lines in the spectra of gases (“Cause of Double Lines in Spectra,” ...

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Karst wetlands, with their distinctive calcium-rich soils and dynamic hydrology, face growing ecological challenges due to biodiversity loss, habitat degradation, and climate change. Accurate ...

Scientists now understand that the universe forges its heaviest elements, including californium, through extreme cosmic ...