Neutron initiator and computer: what they have in common

1. Step 1. Neutron initiator — is part of — Nuclear weapon. It starts the chain reaction.
2. Step 2. Nuclear weapon — uses — Chain reaction. An uncontrolled chain reaction.
3. Step 3. Chain reaction — uses — Nuclear fission. Fission neutrons cause new fissions.
4. Step 4. Nuclear fission — evolved from — Radioactivity. Studying radioactive decay led to the discovery of fission.
5. Step 5. Radioactivity — is used in — PET scanner. A radioactive tracer.
6. Step 6. PET scanner — uses — Computer. Reconstruction.

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