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How Not to Be Fooled · Chapter 4

Together Is Not Because

Correlation, lurking variables, and arrows that point the wrong way

Ice cream and swimming, roosters and sunrise, storks and chimneys. Jules learns that two numbers rising together is a clue — and 'because' is a word that has to earn a badge.

12 panels · ~6 min read

A summer boardwalk shows busy ice-cream carts beside a crowded beach, while a kid draws two arrows rising together.

Panel 1

A researcher sketches a blazing sun between an ice-cream cart and a beach, showing heat as the hidden third cause.

Panel 2

A rooster crows on a fence as the sun lifts on the horizon, while a kid realizes the bird does not cause morning.

Panel 3

Storks nest on tall village rooftops above a street of baby carriages, hinting that houses — not storks — link the two.

Panel 4

A rainy street full of umbrellas and wet pavement, while a kid jokes that umbrellas do not cause rain.

Panel 5

A child plays piano near a report card while parents with books wait in the background, suggesting more than one cause.

Panel 6

A researcher waters one of two identical plant pots on the same windowsill, leaving the other dry on purpose.

Panel 7

On the same windowsill, a watered plant stands taller beside a drooping dry plant.

Panel 8

Several fire trucks surround a large fire, illustrating that bigger emergencies draw more trucks rather than trucks causing damage.

Panel 9

A researcher sketches two figures traveling together and a third sneaky character with a lever, the hidden cause.

Panel 10

A kid holds a news clipping of two rising arrows while a researcher peels it back to reveal a hidden third cause.

Panel 11

At dusk a kid writes that together is not because, while a researcher hints at tomorrow's lesson on rare events.

Panel 12

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Read chapter text: Together Is Not Because

Ice cream and swimming, roosters and sunrise, storks and chimneys. Jules learns that two numbers rising together is a clue — and 'because' is a word that has to earn a badge.

  1. Panel 1

    A summer boardwalk shows busy ice-cream carts beside a crowded beach, while a kid draws two arrows rising together.

    Ice-cream sales rise. So do swimming accidents. A messy notebook might conclude that cones cause trouble. Summer is standing right there, uninvited.

    Jules: Two lines go up together. That feels like a culprit.

  2. Panel 2

    A researcher sketches a blazing sun between an ice-cream cart and a beach, showing heat as the hidden third cause.

    A lurking variable is the hidden third thing that shoves both numbers. Heat makes people buy cones. Heat also fills the water. The cones did not push anyone in.

    Nia: Together is not because. Always hunt for the uninvited third.

  3. Panel 3

    A rooster crows on a fence as the sun lifts on the horizon, while a kid realizes the bird does not cause morning.

    The rooster crows, then the sky brightens. Order in time is not a proof. The sun was coming anyway. The bird is a noisy clock, not an engine.

    Jules: If I silenced every rooster, morning would still show up.

  4. Panel 4

    Storks nest on tall village rooftops above a street of baby carriages, hinting that houses — not storks — link the two.

    Old stories tied stork nests to more babies. Taller houses had room for nests — and room for bigger families. The birds were renting the roofs, not delivering the kids.

    Nia: The houses were the third thing. Charming birds got the credit.

  5. Panel 5

    A rainy street full of umbrellas and wet pavement, while a kid jokes that umbrellas do not cause rain.

    Umbrellas appear, streets get wet. You could claim umbrellas cause rain. Or you could notice the clouds, which invited both.

    Jules: If umbrellas caused rain, indoor closets would be storms.

  6. Panel 6

    A child plays piano near a report card while parents with books wait in the background, suggesting more than one cause.

    Kids who play piano often have strong grades. Maybe music helps. Maybe households with time, books, and patience are behind both.

    Nia: A headline that stops at piano is only half a sentence.

  7. Panel 7

    A researcher waters one of two identical plant pots on the same windowsill, leaving the other dry on purpose.

    To test a because, change one thing on purpose. Two pots. Same dirt, same window. Water only one. Now a difference has a fair chance of a cause.

    Jules: If I water both, or move one to a closet, I ruin the test.

  8. Panel 8

    On the same windowsill, a watered plant stands taller beside a drooping dry plant.

    Later, one plant is taller. Because you changed only water, water is the best suspect. Messy life rarely gives you a test this clean — so you stay humble.

    Nia: Experiments are how we stop guessing which arrow is the engine.

  9. Panel 9

    Several fire trucks surround a large fire, illustrating that bigger emergencies draw more trucks rather than trucks causing damage.

    Bigger fires get more trucks. If you only plot trucks against damage, trucks look guilty. The fire called the trucks. That is reverse causation.

    Jules: So the arrow can point the other way. The effect hired the 'cause.'

  10. Panel 10

    A researcher sketches two figures traveling together and a third sneaky character with a lever, the hidden cause.

    When two things travel together, sketch three suspects: A causes B, B causes A, or C shoves both. If you cannot tell, do not print a because.

    Nia: A because is a serious word. Make it earn the badge.

  11. Panel 11

    A kid holds a news clipping of two rising arrows while a researcher peels it back to reveal a hidden third cause.

    Headlines love a clean villain. Your job is to lift the corner and look for the third wheel — heat, houses, clouds, time, money.

    Jules: I will not let two arrows boss me without a third question.

  12. Panel 12

    At dusk a kid writes that together is not because, while a researcher hints at tomorrow's lesson on rare events.

    Together is a clue, not a verdict. The world is full of third wheels. Name them, or stay quietly unsure.

    Nia: Tomorrow: the rare and the loud. Your brain keeps the volume knob.