Thyristor and chisel: what they have in common

1. Step 1. Thyristor — evolved from — Diode. A controllable counterpart of the diode with a four-layer structure.
2. Step 2. Diode — includes — LED. A light-emitting diode.
3. Step 3. LED — is part of — Street light. LEDs.
4. Step 4. Street light — is part of — Tunnel. Lighting.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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