Tetris and r-7 rocket: what they have in common

1. Step 1. Tetris — is used in — Handheld console. Tetris on the Game Boy.
2. Step 2. Handheld console — has part — Display. A handheld console has its screen built in.
3. Step 3. Display — is part of — VR headset. A VR headset has two displays, one per eye.
4. Step 4. VR headset — has part — Gyroscope. Head tracking.
5. Step 5. Gyroscope — is part of — V-2 rocket. A gyroscopic guidance system.
6. Step 6. V-2 rocket — evolved into — R-7 rocket. The Soviet rocket programme began by studying the V-2 (the R-1 was its copy).

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