Gas burner and computer: what they have in common

1. Step 1. Gas burner — is part of — Hot air balloon. It heats the air in the envelope with a propane flame.
2. Step 2. Hot air balloon — evolved into — Airship. A steerable balloon.
3. Step 3. Airship — uses — Helium. After the Hindenburg — helium.
4. Step 4. Helium — is material for — MRI. The magnet is cooled with liquid helium.
5. Step 5. MRI — uses — Computer. Image reconstruction.

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