Dynamite and shipping container: what they have in common

1. Step 1. Dynamite — works like — Tunnelling shield. Two ways of driving tunnels — mechanical and explosive.
2. Step 2. Tunnelling shield — uses — Hydraulic cylinder. The shield was pushed forward by jacks.
3. Step 3. Hydraulic cylinder — is part of — Forklift. Lifting the forks.
4. Step 4. Forklift — uses — Pallet. It works with pallets.
5. Step 5. Pallet — works like — Shipping container. Standardizing units of cargo.

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