The Clock of Molecular Noise
Every second, the text of life is being copied inside the cells of your body: RNA molecules are read from DNA to build proteins. But the copyist is not perfect. It skips letters, inserts extra ones, sometimes stops mid-sentence. These errors pile up like typos in a reprinted book, gradually turning the cell into a library of damaged volumes.
Until recently, no one could count these typos across an entire organism.