X-ray crystallography and bellows: what they have in common

1. Step 1. X-ray crystallography — uses — X-rays. X-ray diffraction.
2. Step 2. X-rays — uses — Vacuum. Röntgen discovered the rays while experimenting with a discharge in an evacuated Crookes tube.
3. Step 3. Vacuum — is used in — Vacuum pump. The pump creates a vacuum.
4. Step 4. Vacuum pump — has part — Check valve. Valves stop air from flowing back.
5. Step 5. Check valve — is part of — Bellows. An air intake valve.

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