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Richard Mayne was given access to the Radioactivity and units of measurement 1 4 years, 6 months ago

Richard Mayne was given access to the Square and cube numbers 1 4 years, 6 months ago

Richard Mayne was given access to the Laws of Indeces 2 4 years, 6 months ago

Richard Mayne was given access to the Equations old 4 years, 6 months ago