X-ray tube and electronic calculator: what they have in common

1. Step 1. X-ray tube — is part of — Mammograph. A source of soft X-rays.
2. Step 2. Mammograph — is made of — Tungsten. The tube anode is molybdenum or tungsten.
3. Step 3. Tungsten — is material for — Ion thruster. The cathodes are tungsten.
4. Step 4. Ion thruster — has part — Solar panel. Power supply.
5. Step 5. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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