Uranium and dewar flask: what they have in common

1. Step 1. Uranium — is material for — Nuclear submarine. The fuel is uranium.
2. Step 2. Nuclear submarine — evolved from — Submarine. Nuclear power let submarines stay submerged for months.
3. Step 3. Submarine — has part — Periscope. A periscope.
4. Step 4. Periscope — has part — Mirror. Mirrors or prisms.
5. Step 5. Mirror — is part of — Vacuum flask. The silvering reflects heat radiation.
6. Step 6. Vacuum flask — evolved from — Dewar flask. A household Dewar flask.

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