volume of average human = 62 liter = 0.062 m^3 = 2.2 ft^3 = 16 gallon
blend. (but how much of the internal volume of a human is gas?)
slurry would fill a cube with side length 40 cm = 1.3 ft.
100 square foot room with 9 ft ceiling fits 411 people.
all of humanity fits in a cube with side length less than 1 km. 16 billion people = 1 cubic kilometer. 67 billion people = 1 cubic mile.
perhaps someday humans gain shapeshifting ability (like Odo), pack themselves into a temperature-controlled Borg Cube, then head for the stars.
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