Shoe heel and data centre: what they have in common

1. Step 1. Shoe heel — is part of — Footwear. A heel.
2. Step 2. Footwear — is made of — Leather. Leather.
3. Step 3. Leather — is material for — Submarine. It was covered with leather.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
5. Step 5. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
6. Step 6. Uninterruptible power supply — is part of — Data centre. Backup power.

Open Evothings