Overview

• Grade Level: AP Physics / AP World History / AP US History / General Science (grades 9-12)

• Time Required: Bell-ringer (7 min audio), single class (45 min), or extended (2 classes)

• Historical Period: World War II era physics (1938-1956) and 21st-century fusion research

• Modern Connection: KSTAR tokamak 102-second plasma record and the path to commercial fusion energy

Learning Objectives

Students will be able to:

1. Describe the key differences between nuclear fission and nuclear fusion as energy sources

1. Explain how Chicago Pile-1 demonstrated controlled fission and why KSTAR's 102-second plasma is the equivalent threshold moment for fusion

1. Analyse the gap between proof-of-concept and commercial deployment for transformative energy technologies

1. Evaluate the claim that fusion energy is "always 30 years away" in light of recent KSTAR results

Before Reading

Anticipation Questions

1. What is the difference between nuclear fission (splitting atoms) and nuclear fusion (combining atoms)? Which powers the sun?

1. How long do you think it takes between proving a new energy technology works and plugging it into the power grid? What factors determine the length of that gap?

1. Why might controlling a nuclear reaction be harder than simply triggering one?

Key Vocabulary

• Fission: splitting a heavy atomic nucleus into lighter nuclei, releasing energy

• Fusion: combining light atomic nuclei into heavier ones, releasing energy (powers the sun)

• Chain reaction: a self-sustaining nuclear reaction where the products trigger further reactions

• Tokamak: a donut-shaped magnetic confinement device for containing fusion plasma

• Plasma: superheated matter (the fourth state, beyond solid/liquid/gas) where electrons are stripped from atoms

• Control rod: a neutron-absorbing rod used to regulate fission reactions

• Critical mass/criticality: the point at which a nuclear chain reaction becomes self-sustaining

• Magnetic confinement: using powerful magnetic fields to hold plasma in place since no physical container can withstand fusion temperatures

During Reading

Guided Questions

1. What safety measures did Fermi's team use during the Chicago Pile-1 experiment? What does this tell you about their confidence in the mathematics?

1. Why does the story describe a bomb as "the opposite of control"?

1. What specific engineering challenge makes fusion harder to control than fission?

1. Why does the author compare KSTAR's 102 seconds to Fermi's 28 minutes?

After Reading

Discussion Questions

1. Fermi's team had no radiation shielding and relied on a "liquid control squad" with buckets. Would this experiment be permitted today? Should it have been permitted then?

1. The gap between CP-1 (1942) and commercial fission (1954-1956) was 12-14 years. Fusion has been waiting 74 years since Ivy Mike (1952). What accounts for the difference?

1. The coded phone call ("The Italian navigator has landed in the new world") was necessary because CP-1 was part of the Manhattan Project. How does the military origin of fission compare to the civilian origin of fusion research?

1. The story ends with "Can you hold it?" What does "holding" mean differently for fission vs fusion?

1. If KSTAR's 102 seconds is truly the "squash court moment" for fusion, and the fission gap was 12 years, when might we see commercial fusion? What assumptions does that estimate depend on?

The Parallel

1. What is structurally similar between Chicago Pile-1 and KSTAR? (Consider: proving sustained control, the threshold from theory to practice, the safety risks)

1. What is fundamentally different? (Consider: the political context, the temperature scales, the engineering challenges, the funding models)

1. The story implies that every transformative energy technology has a "gap" between proof and deployment. Is this gap inevitable, or could it be shortened by policy decisions?

Activities

Bell-Ringer (7 minutes)

Play the audio narration. Write on the board: "28 minutes vs 102 seconds. Which matters more?" After listening, ask students to explain why both numbers represent the same kind of achievement despite appearing very different.

Single Class (45 minutes)

• 0-7 min: Audio narration (bell-ringer)

• 7-12 min: Quick-write: "Is fusion energy worth the 74-year wait? Why or why not?"

• 12-20 min: Mini-lecture: the physics of fission vs fusion (use diagrams showing atom splitting vs combining, energy release curves, binding energy per nucleon chart)

• 20-32 min: Small group activity: each group is assigned one energy technology (fission, fusion, solar, wind, geothermal) and must create a timeline showing: proof of concept → first prototype → first commercial plant → widespread adoption. Groups compare timelines.

• 32-42 min: Whole-class discussion: why do some energy transitions take decades while others (solar) have accelerated recently?

• 42-45 min: Exit ticket: "Name one thing that could shorten the fusion gap and one thing that could lengthen it."

Extension Activity

Research project (2-3 days): Compare the funding history of fusion research to another "long wait" technology (e.g., quantum computing, gene therapy, space colonisation). Create a poster or presentation answering: how much has been invested, what milestones have been achieved, and what would it take to cross the threshold from laboratory to grid/market? Use at least three primary sources.

Primary Source Connections

1. Arthur Compton's telephone call transcript (December 2, 1942): the coded exchange "The Italian navigator has landed in the new world." Type: historical transcript. Available via the Atomic Heritage Foundation and DOE archives.

1. Enrico Fermi's CP-1 logbook entries: neutron multiplication factor readings from December 2, 1942. Type: laboratory notebook. Available via Argonne National Laboratory archives.

1. KSTAR press release (February 2026): Korea Institute of Fusion Energy announcement of the 102-second record. Type: institutional press release. Available at kfe.re.kr.

1. President Eisenhower's "Atoms for Peace" speech (December 8, 1953): the political framework that enabled civilian nuclear power. Type: presidential address. Available via the Eisenhower Presidential Library.

Standards Alignment

C3 Framework

• Dimension 1 (Developing Questions): supports compelling question "How long should society wait for a transformative technology to mature, and who decides when to invest?"

• Dimension 2 (Applying Concepts): applies scientific and technological change over time; cause and effect in energy policy

• Dimension 3 (Evaluating Sources): the story's evidence manifest provides a model of claim verification; students compare primary accounts of CP-1 with the narrative

• Dimension 4 (Communicating Conclusions): the timeline comparison activity requires students to construct evidence-based arguments about technology adoption rates

AP Alignment

• AP Physics 2: Big Idea 7, Quantum, Atomic, and Nuclear Physics (nuclear reactions, binding energy, fission vs fusion)

• AP World History: Key Concept 6.1, Science and the Environment (nuclear technology as transformative force); Key Concept 6.2, Global Conflicts and Their Consequences (Manhattan Project context)

• AP US History: Period 7, 1890-1945 (wartime science and the atomic age); Period 8, 1945-1980 (Atoms for Peace and civilian nuclear power)