To tell you the truth, I sometimes find it a bit tiresome," Fiona said... - Daniel Handler

I'll have ten grams of rice, Mrs. Bass interrupted, one tenth of a hectogram of shrimp vindaloo, a dekagram of chana aloo masala, one thousand centigrams of tandori salmon, four samosas with surface area of nineteen cubic centimeters, five deciliters of mango lassi, and a sada rava dosai that's exactly nineteen centimeters long.

Even though there are no ways of knowing for sure, there are ways of knowing for pretty sure.

A passport, as I'm sure you know, is a document that one shows to government officials whenever one reaches a border between two countries, so that the official can learn who you are, where you were born, and how you look when photographed unflatteringly.