Portable speaker and nuclear reactor: what they have in common

1. Step 1. Portable speaker — has part — Lithium-ion battery. A lithium-ion battery.
2. Step 2. Lithium-ion battery — evolved from — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.
3. Step 3. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
4. Step 4. Submarine — evolved into — Nuclear submarine. Nuclear power let submarines stay submerged for months.
5. Step 5. Nuclear submarine — has part — Nuclear reactor. A reactor.

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