Narrow stone passages e ventilador elétrico: o que têm em comum

1. Passo 1. Narrow stone passages — faz parte de — Egyptian pyramid. Passages inside the mass.
2. Passo 2. Egyptian pyramid — utiliza — Inclined plane. According to a common hypothesis, the blocks were raised on ramps.
3. Passo 3. Inclined plane — evoluiu para — Screw. A screw is an inclined plane wrapped around a cylinder.
4. Passo 4. Screw — é utilizado em — Propeller. A propeller “screws” itself into the water, like an Archimedes’ screw.
5. Passo 5. Propeller — faz parte de — Ventilador elétrico. The blades.

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