the.com/nanogram
A billionth of a gram, which is to say: basically a rumor of mass.
means A unit of mass equal to one billionth of a gram, used to weigh things almost too tiny to weigh.
from From Greek nanos (dwarf) plus gram, from gramma (small weight); the prefix nano was made official in 1960.
ScaleA single human cell weighs roughly one nanogram.
Drug dosesSome hormones act at nanogram levels in blood.
Next doorA thousand picograms, a thousandth of a microgram.