Every time you write by hand, you leave something that no machine can reproduce. Your handwriting is a signature you did not choose and cannot change — the slant of your letters, the pressure of your pen, the way your g loops or does not. It is, quite simply, one of the most personal things you will ever make.
Now think about how rare handwriting is becoming. We type our letters, our notes, our diaries. Our messages are stored in a thousand digital boxes that will be deleted, upgraded, or forgotten within a generation. But a note written by hand has already outlived every email you will ever send — because paper does not need a password, a server, or a service to remain readable.
Consider the oldest surviving love letters in the world: a stack of Persian letters from around the year 900, preserved in a cave in Tajikistan. The ink has faded, but the handwriting — the handwriting of a woman writing to her husband more than a thousand years ago — still shows her impatience, her fear, her tenderness. No one can be sure of her name, but everyone can read her feeling. That is what handwriting does. It carries a person's emotional temperature across centuries.
Here is the small thing we are asking you to do. Take a piece of paper, and write a single sentence in your own hand. It can be a memory, a fear, a promise, or just today's date and one thing that happened. Then keep it somewhere safe — a drawer, a book, a box. You do not need to seal it for a thousand years. Twenty years from now, when you find it, you will not recognize your own handwriting at first. And when you do, you will feel the same thing every descendant of every handwritten note has felt: here is a person I used to be, reaching forward to touch me.
Machines will preserve your data. Only your hand can preserve you. Write it down, in your own hand. That is the whole secret.