I’ve stood in a hardware store aisle more than once, staring at a bolt labeled 10mm, with no real sense ...

Hold up a pea between your fingers, and you’re holding almost exactly 7mm. 7mm equals about 0.28 inches, roughly a ...

Hold a grain of rice between two fingers. That’s about 3mm roughly 0.118 inches, or just a hair under 1/8 ...

8mm works out to about 0.31 inches, just shy of a third of an inch, and close to the size ...

Pull a grain of rice out of the pantry, or a peppercorn out of the grinder, and look at it ...