Free educational resources for Mathematics, Physics, Chemistry, Biochemistry, Astronomy, Geophysics, and Others.
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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,..

Free resources for MATHEMATICS
Free resources for PHYSICS
Free resources for CHEMISTRY
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