Cell Size Determined by Gravity - New Technology Leads to Discovery

The typical animal cell measures about 10 microns, or 0.001 centimeters, in diameter. Which is unsurprising—cells are small! that's sort of the point!—and, at the same time, curious. Animals exhibit nothing if not biodiversity, yet the building blocks we all share are, with very few exceptions, astoundingly similar in size.

http://www.theatlantic.com/technology/archive/2013/10/q-why-do-animal-cells-stay-so-small-a-gravity/280912/