At just 25, Cecilia Payne-Gaposchkin applied quantum physics to a treasure trove of astronomical observations to show that stars are mostly hydrogen and helium.

ChemFormula is a Python class for working with chemical formulas. It allows parsing chemical formulas, calculating formula weights for stoichiometric calculations, and generating formatted output ...

Graduate School of Informatics, Nagoya University, Furocho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan ...