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Setup

EXPERIMENT-DESIGN

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01 Opening
Setup beat 1 of 5

Setup is a small beaver-tween with warm russet-and-cream fur and steady paws. Strapped to her side is a small wooden board, shaped like a hand and carved with three columns: CHANGE (the one thing you'll change), MEASURE (what you'll keep track of), and KEEP-THE-SAME (everything else). Each column has slots she fills in with chalk. Everyone notices the board — it's her most special thing.

Setup teaches experiment design, and her rule is strict and simple: one thing changes, everything else stays. "If you change two things at once," she says, "you'll never know which one caused the result." So the board keeps her honest: one variable in CHANGE, one in MEASURE, and everything else pinned down in KEEP-THE-SAME.

02 Setup
Setup beat 2 of 5

Setup grew up in a small village, in a family of dam-builders who had to be endlessly careful — thinking about water flow, mud, how steep the ground was — because a dam that failed could flood a whole village.

But she learned the one-thing-changes rule the funny, hard way, with a plant. "I once tried to grow a super plant," she tells the class, shaking her head. "I was so excited I changed everything at once — new soil, more water, extra sunlight, all together." She pauses, letting them lean in. "And the plant grew huge — taller than me! But..." She spreads her paws helplessly. "I had no idea why. Was it the soil? The water? The sun? I'd changed so many things I'd ruined my own test — I couldn't learn a single thing from my giant plant." That was the day the rule sank in. "It's a boring rule," Setup admits. "Change just one thing; keep everything else exactly the same. But boring or not, it's the only way to really find out what works." She's built her tests on that board ever since.

03 Setup
Setup beat 3 of 5

When Setup was twenty-two, she walked to ScienceForge. Prism, the leader, asked, "What is experiment design?"

Setup didn't blink. She pointed to her board. "CHANGE, MEASURE, KEEP-THE-SAME. One thing changes; everything else stays. That's the test."

Prism smiled. "You are appointed."

04 Setup
Setup beat 4 of 5

In her workshop, Setup teaches the steps, filling her board as she goes. Find the ONE thing you'll change — the independent variable — and write it in CHANGE. Decide what you'll measure — the dependent variable — in MEASURE. List everything else — the controlled variables — in KEEP-THE-SAME, and hold them still. Always use a control group — a normal, unchanged test to compare against. Do the test more than once — one try isn't enough; many tries show whether an effect is real or just luck. Test lots of things — bigger groups give steadier answers. Watch for hidden problems — sneaky confounders that can fool you into thinking something worked when it didn't. And write down your steps, so anyone (including future-you) can run the same test again. And she's honest that it isn't glamorous: "Most new experiments go wrong for the same reason — people change too many things at once. Ten quiet minutes filling out this board before you start saves you hours of confused numbers later." She taps the wood. "It's not hard. It's just: one thing changes, everything else stays."

05 Closing
Setup beat 5 of 5

"Is designing an experiment hard?" a student asked her once. Setup tapped her board. "It isn't hard. It's just: one thing changes, everything else stays. Spend ten calm minutes on this board first, and the rest goes smooth."

She looked at the control-variable-board, all three columns filled in and ready — CHANGE, MEASURE, KEEP-THE-SAME — and a calm settled over her, steady and unhurried. That quiet sureness — the good, grounded feeling of knowing exactly what she was testing and why, with nothing muddled and nothing left to chance — was, more than any dramatic giant-plant result, the thing that made her happiest. Because a test you understand, she knew, is a test that can actually teach you something true.

Hear it as an audio drama

A short play starring Setup, from ScienceForge. Different voices, same idea. Listen any time after you read.

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Read the drama script
  1. Narrator: From Spark and Anvil and ScienceForge — this is Setup, in chapter 1 of the ScienceForge cast.
  2. Narrator: This drama uses an AI-generated voice. Voiced via Gemini 2.5.
  3. Narrator: Setup is a small beaver-tween, the quietest thing in ScienceForge. A small wooden board is always strapped to her side.
  4. Narrator: It is her control-variable-board, with three columns carved into it: CHANGE, MEASURE, and KEEP-THE-SAME.
  5. Setup: I teach the discipline of 'one-thing-changes-everything-else-stays'. Most novice experiments fail because they change too much at once.
  6. Setup: My board isolates the variables. The one thing you CHANGE. The one thing you MEASURE.
  7. Setup: And all the other things you must KEEP-THE-SAME. That is the only way to know what truly happened.
  8. Narrator: Setup grew up in a village of dam-builders. Careful isolation of variables was the foundation of their work.
  9. Setup: By age six, I knew the lesson. To make something work, you must isolate one change at a time.
  10. Narrator: At her ScienceForge interview, the founder Prism looked at her board and asked one simple question.
  11. Prism: What is the foundation of a good experiment, according to that board of yours?
  12. Setup: CHANGE, MEASURE, KEEP-THE-SAME. One variable changes. Everything else stays. That is the test.
  13. Prism: Your discipline is clear. You are appointed.
  14. Narrator: One thing changes. Everything else stays. That's the discipline. That's what makes an experiment an experiment.
  15. Narrator: You've been listening to a Spark and Anvil chapter, written by the Spark and Anvil writing team for ages 9 to 14.
  16. Narrator: Apps stay free forever.
  17. Narrator: Curriculum aligned to Common Core and Next Generation Science Standards.
  18. Narrator: Released under Creative Commons BY-NC-SA 4.0 for educational reuse. Visit Spark and Anvil for the full transcript.

The ScienceForge ensemble

Setup is one of the friends in ScienceForge. Each friend shows you one idea by how they act; meet them all and you have the whole subject.

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