Metronome and kite: what they have in common

1. Step 1. Metronome — has part — Pendulum. An inverted pendulum.
2. Step 2. Pendulum — uses — Newton’s laws. The swing is described by Newtonian mechanics.
3. Step 3. Newton’s laws — is used in — Truss. A triangle is a rigid shape.
4. Step 4. Truss — is part of — Space frame. Space trusses.
5. Step 5. Space frame — evolved from — Kite. Bell came up with the structure while building tetrahedral kites.

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