Quantum dots and LIGO: what they have in common

1. Step 1. Quantum dots — is a kind of — Semiconductor. Quantum dots are tiny semiconductor crystals that glow in pure colours.
2. Step 2. Semiconductor — is material for — Laser. Maiman’s first laser was a ruby crystal; today it is more often a semiconductor.
3. Step 3. Laser — is used in — LIGO. A laser.

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