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Amino acids
Nitrogenous bases for DNA and RNA (adenine, guanine, cytosine, thymine and uracil).
Carbohydrates (saccharides): aldoses and ketoses.
Genetic code, ...
Astronomical constants
Phases of the Moon
Eclipses, Equinoxes, Solstices, Perihelion, Aphelion...
Scientific constants
S.I. units, definitions and conversion factors,..
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pH, concentrations, equilibrium constants...
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