Hindu–Arabic numerals and lead–acid battery: what they have in common

1. Step 1. Hindu–Arabic numerals — is used in — Algorithm. Al-Khwarizmi described calculations in decimal notation.
2. Step 2. Algorithm — is used in — Chess computer. A search through the tree of moves.
3. Step 3. Chess computer — has part — Server. IBM RS/6000 SP nodes.
4. Step 4. Server — is part of — Data centre. Thousands of servers.
5. Step 5. Data centre — has part — Uninterruptible power supply. Backup power.
6. Step 6. Uninterruptible power supply — has part — Lead–acid battery. A battery.

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