Filter paper and atomic clock: what they have in common

1. Step 1. Filter paper — is part of — Paper coffee filter. It holds back the grounds.
2. Step 2. Paper coffee filter — works like — Water filter. Filtering a liquid through a porous medium.
3. Step 3. Water filter — is made of — Silica (sand). Slow filters are layers of sand and gravel.
4. Step 4. Silica (sand) — is material for — Quartz clock. The resonator is a quartz crystal.
5. Step 5. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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