Hollow bronze sphere and lead–acid battery: what they have in common

1. Step 1. Hollow bronze sphere — is part of — Heron’s aeolipile. It rotates on tubular axles.
2. Step 2. Heron’s aeolipile — evolved into — Turbine. The aeolipile is the oldest ancestor of the steam turbine.
3. Step 3. Turbine — includes — Steam turbine. A kind of turbine.
4. Step 4. Steam turbine — is part of — Nuclear submarine. A turbine turns the propeller.
5. Step 5. Nuclear submarine — evolved from — Submarine. Nuclear power let submarines stay submerged for months.
6. Step 6. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

Open Evothings