Speaking about our bodies, we have at least 10^13 cells in our body, or ten trillion. Other figures go as high to 50 to 75 trillion cells.
Now admit it. You look at 10 trillion cells, and then at 50 trillion cells, and all you say is 'Oh'. Doesn't matter that the first figure is 1,600 times our world population, and that the second one 8,000 times.
Indeed, this number is baffling in more ways than one. 10 trillion cells fitted into a body 1.7m by 0.1m by 0.4m on average is something rather unimaginable, however real it is. The resources required to keep all these cells alive is just as, if not more, perplexing to anyone without scientific knowledge.