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In SI units, the values of c, h, e and k B are exact and the values of ε 0 and G in SI units respectively have relative uncertainties of 1.6 × 10 −10 [16] and 2.2 × 10 −5. [17] Hence, the uncertainties in the SI values of the Planck units derive almost entirely from uncertainty in the SI value of G .
A single dose of LSD is typically between 40 and 500 micrograms—an amount roughly equal to one-tenth the mass of a grain of sand. ... (ranging from 2.2 to 3.4 hours ...