Here's what I get. > Scientists recently made the most precise estimate so far of the number of cells in the human body — a whopping 3.72 × 10^13 cells! They then used tabulated values and some other tricks to arrive at a value of roughly 27 pg for the average mass of a cell. About 65 % of a cell's mass is water. Thus, an average cell contains about 18 pg of water and 9 pg of other ... More @Wikipedia
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