Electric toothbrush and laser: what they have in common

1. Step 1. Electric toothbrush — evolved from — Toothbrush. A motorized toothbrush.
2. Step 2. Toothbrush — is made of — Bone. Addis’s toothbrush has a bone handle.
3. Step 3. Bone — is material for — Spectacle frame. The first frames were made of bone and horn.
4. Step 4. Spectacle frame — is part of — Glasses. A frame.
5. Step 5. Glasses — works like — Laser surgery. Laser vision correction solves the same problem as glasses — it changes refraction, but in the cornea itself.
6. Step 6. Laser surgery — uses — Laser. A laser.

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