01abstract
Dissociative Identity Disorder
When the same brain hosts more than one self.
PsychologyHuman Mind
Loading…
Loading…
Leonardo da Vinci, c.1490 — photo Luc Viatour
Picture this
On a logarithmic ruler of the universe, an adult human sits almost exactly in the middle — about as far above a proton as the observable universe is above us.
A 1.7-metre human sits, strikingly close, to the geometric average of the smallest and largest things we know. On a logarithmic scale, you are about as far above a proton as the observable universe is above you. Earth's scale puts us at the middle of everything we can measure — and the middle is a remarkably comfortable place to think from.
Glossary
Did you know?
Almost every hydrogen atom in your body has existed since the first few minutes after the Big Bang. Everything heavier was forged inside stars that lived and died before our Sun was born.
Last updated 2026-05-17
You are here
Scale
Roughly the geometric mean of the universe.
Size
1.70 m
Tap a dot to preview it. Use the Open stop link to read its full page. Stops are arranged from smallest on the left to largest on the right.
