01 · Life · 6 min
You are a universe
Move inward from a human body to cells, molecular machinery, atoms and the physical limit where ordinary ideas of size stop behaving normally.
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01
Opening coordinate · Familiar · People
Begin at human scale
Adult human · ≈1.75 mYour body is the familiar reference, but it is built from nested worlds that operate far below sight.
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02
First threshold · Cellular · Human biology
A city of cells
Human cell · ≈20 µmA representative human cell is only tens of micrometres wide, yet it coordinates transport, energy and repair.
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03
First threshold · Cellular · Human biology
Built to bend
Red blood cell · ≈8 µmRed blood cells squeeze through capillaries while carrying oxygen to tissues throughout the body.
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04
Perspective shift · Cellular · Microbiology
Life within life
Bacterium · ≈2 µmA bacterium is smaller than most human cells but still contains thousands of interacting molecular systems.
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05
Deep crossing · Cellular · Virology
Below the cellular threshold
Coronavirus particle · ≈100 nmA virus particle is not a cell; it depends on cellular machinery to reproduce.
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06
Deep crossing · Cellular · Cell biology
The protein factory
Ribosome · ≈25 nmRibosomes translate genetic instructions into the proteins that build and operate living systems.
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07
Revelation · Molecular · Genetics
Instructions two nanometres wide
DNA double helix · ≈2 nm wideDNA is extraordinarily thin, but the sequence along its length stores biological information.
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08
Revelation · Molecular · Atomic physics
Atoms are mostly probability
Hydrogen atom · ≈106 pmThe atom is not a miniature solar system; quantum mechanics describes where its electron may be found.
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09
Return signal · Quantum · Fundamental physics
Inside the nucleus
Proton · ≈1.68 fmA proton is governed by quarks, gluons and quantum fields rather than a clean mechanical surface.
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Return signal · Quantum · Fundamental physics
Where the map changes
Planck length · 1.616 × 10⁻³⁵ mThe Planck length is a reference scale where our current theories no longer combine cleanly. It is not a proven smallest pixel of space.
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Expedition complete
You crossed 35.0 orders of magnitude.
The route began at Adult human and ended at Planck length. The next step is to place both endpoints inside the same comparison engine and inspect what the raw ratio means.