Magnetism and glasses: what they have in common

1. Step 1. Magnetism — is used in — Hall sensor. It responds to a magnetic field.
2. Step 2. Hall sensor — uses — Electron. The magnetic field deflects the electrons.
3. Step 3. Electron — is used in — Electron microscope. A beam of electrons instead of light.
4. Step 4. Electron microscope — evolved from — Microscope. Overcoming the limit of optics.
5. Step 5. Microscope — evolved from — Glasses. Spectacle makers assembled the first microscopes.

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