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  2. LSD - Wikipedia

    en.wikipedia.org/wiki/LSD

    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 ...

  3. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    Hence, a choice to be made when designing a system of natural units is which, if any, instances of 4 π appearing in the equations of physics are to be eliminated via the normalization. Normalizing 4 π G to 1 (and therefore setting G = ⁠ 1 / 4 π ⁠): Gauss's law for gravity becomes Φ g = −M (rather than Φ g = −4 π M in Planck units).