Abacus and air conditioner: what they have in common

1. Step 1. Abacus — works like — Hindu–Arabic numerals. Positional counting with beads.
2. Step 2. Hindu–Arabic numerals — is used in — Algorithm. Al-Khwarizmi described calculations in decimal notation.
3. Step 3. Algorithm — is used in — Chess computer. A search through the tree of moves.
4. Step 4. Chess computer — has part — Server. IBM RS/6000 SP nodes.
5. Step 5. Server — is part of — Data centre. Thousands of servers.
6. Step 6. Data centre — has part — Air conditioner. Cooling.

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