What makes something true?

Source notes

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What Makes Something True?

A research guide for 3rd–5th grade truth detectives

1. Big idea: We are all truth detectives

Every day you decide what to believe.

• A friend says, "My cousin saw a real dragon at the park!"
• A video online claims, "If you hold your breath for 2 minutes every day you will never get sick."
• A teacher says, "The Earth orbits the Sun."

You cannot treat all of these the same way. Grown‑up researchers and teachers study how kids decide what to believe and how to help them make good choices. Their work shows that even elementary school students can learn to think like truth detectives: asking good questions, checking evidence, and changing their minds when new facts appear.[[1]](https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.00459/full?TBiframe=true&width=921.6&height=921.6)[[2]](https://link.springer.com/article/10.1007/s11191-023-00460-5?error=cookiesnot_supported&code=4d321902-428b-4420-8c19-a3a97489b4f6)[[3]](https://www.ejsee.com/download/critical-thinking-in-national-primary-science-curricula-13271.pdf)
This report is your guide. It pulls together ideas from scientists, philosophers, and educators and explains them in kid‑friendly language so 3rd–5th graders can use them in real life.

2. What do we mean by "true"?

Grown‑ups argue a lot about the exact definition of truth, but most agree on a few key points.[[4]](https://philarchive.org/rec/JOATNO-4)[[5]](https://pusdikra-publishing.com/index.php/jsr/article/view/1662)

2.1 Truth vs. opinions vs. pretend

• A fact is something that is true about the world and does not depend on what any one person feels.

• Example: Water freezes at 0°C.
• Example: Spiders are animals.
• An opinion is what someone likes, prefers, or believes is best.

• Example: Chocolate ice cream is better than vanilla.
• Example: This book is boring.
• Pretend or fiction is made‑up on purpose for fun or art.

• Example: A story about friendly dragons who go to school.

Studies with kids show that even young children can tell that facts stay the same when people disagree, but opinions and beliefs can be different for different people.[[6]](https://columbiasamclab.weebly.com/uploads/5/9/0/6/59061709/heiphetzspelkeharrisbanaji2013_jesp.pdf)

2.2 Three helpful ways to think about truth

Philosophers describe truth in several ways. We can explain three of them in simple terms.[[7]](https://philarchive.org/archive/RAAQAT)[[4]](https://philarchive.org/rec/JOATNO-4)

1. Match‑with‑reality (correspondence)

A statement is true if it matches the way the world really is.

• If you say, "There is a cat on the couch," this is true only if a real cat is actually on the couch.

1. Fits‑together (coherence)

A statement is true if it fits well with many other things we already have good reason to believe.

• If you say, "The Sun goes around the Earth in one day," this does not fit with mountains of evidence from astronomy, so we have good reason to say it is not true.

1. Works‑in‑real‑life (pragmatic)

A statement is true enough if acting as if it is true helps us succeed, stay safe, or solve problems.

• For everyday life we treat "There will be sunrise tomorrow" as true so we can plan school and work, even though science also knows stars can eventually die.

For 3rd–5th graders, the most practical idea is:
> A claim is true when it matches reality, fits with strong evidence, and keeps working when we test it.

3. How do scientists search for truth?

Researchers who study science education and child development find that kids can learn real scientific thinking skills much earlier than many adults expect.[[8]](https://www.science.org/doi/10.1126/science.1223416)[[9]](https://pubmed.ncbi.nlm.nih.gov/23019643/)[[10]](https://www.sciencedirect.com/science/article/abs/pii/S0885201417301429)

3.1 The scientific method, kid version

Different books list different numbers of steps, but most scientists agree on the main pattern:[[11]](https://littlebinsforlittlehands.com/using-scientific-method-experiments-kids/)[[12]](https://circuitmess.com/blogs/news/scientific-method-steps-kids)

1. Question – Notice something and ask, "What is going on?"

• Example: "Do plants grow better with music?"

1. Prediction / hypothesis – Make a careful guess you can test.

• "If plants hear music, then they will grow taller than plants with no music."

1. Plan and test (experiment) – Decide what you will change and what you will keep the same, then try it.

• Change: music vs. no music.
• Keep the same: type of plant, size of pot, amount of water, light, soil.

1. Observe and record – Measure, count, or write down what happens.
2. Conclusion – Ask, "Did the results match my prediction? What does this tell me?"

• If yes, that is supporting evidence, but you should still be open to more tests.
• If no, that is also useful. It shows your idea needs changing.

Lessons built around this process help elementary students understand not just science facts but how knowledge is built.[[13]](https://nap.nationalacademies.org/read/11625/chapter/7)[[14]](https://pz.harvard.edu/sites/default/files/NatureofScienceUnit.pdf)[[15]](https://link.springer.com/article/10.1007/s10643-013-0579-4?error=cookiesnotsupported&code=48a57824-97b1-4320-8c69-30168a9d8a2e)

3.2 Evidence, not just guesses

• Research on children’s scientific reasoning shows that kids can learn to choose experiments that give clear evidence, especially when adults model how to compare different possible explanations.[[10]](https://www.sciencedirect.com/science/article/abs/pii/S0885201417301429)[[16]](https://www.harvardlds.org/wp-content/uploads/2018/05/Carey-et-al..-1989.-%E2%80%98An-experiment-is-when-you-try-it-and-see-if-it-works%E2%80%99-a-study-of-grade-7-students%E2%80%99-understanding-of-the-const.pdf)[[17]](https://sites.nationalacademies.org/cs/groups/dbassesite/documents/webpage/dbasse_080105.pdf)
• In one set of studies, children explored mystery boxes and used sounds and other clues to figure out what was inside. They learned that some tests give better evidence than others and started to prefer tests that make it easier to rule out wrong answers.[[18]](https://www.nature.com/articles/s41467-021-23431-2.pdf?error=cookiesnotsupported&code=529b4b8b-d531-4d13-81fd-ed50d1819c2b)

So when you act as a truth detective, you are doing a kid‑sized version of what real scientists do: designing tests that give you strong, clear clues.

4. How do kids tell facts from fake or misleading claims?

The modern world is full of information: books, videos, websites, group chats, and more. Several studies focus on how children handle misinformation.

4.1 Young children and false claims

• Preschoolers and early elementary students already notice when someone’s statement does not match what they directly see.[[19]](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0140658)
• By about 5–10 years old, kids can tell the difference between disagreements about:

• Facts (only one side can be right),
• Preferences (both sides can be "right for them"), and
• Big belief systems, like religions or ideologies (where people often tolerate disagreement).[[6]](https://columbiasamclab.weebly.com/uploads/5/9/0/6/59061709/heiphetzspelkeharrisbanaji2013_jesp.pdf)

This means 3rd–5th graders are ready for more advanced truth‑detective tools.

4.2 Detecting fake or unreliable news

Recent projects taught elementary students how to spot fake or misleading stories online.[[20]](https://digitalcommons.uri.edu/jmle/vol15/iss2/3/)[[21]](https://escholarship.org/uc/item/9bh2z1q9)[[22]](https://www.jdet.net/article/primary-school-pupils-ability-to-detect-fake-science-news-following-a-news-media-literacy-15963)[[23]](https://www.nature.com/articles/s41562-024-02030-3?error=cookiesnotsupported&code=4b9984f5-bfe2-4226-bb75-2db757471b5d)
Researchers found that:

• Many children believe a story just because it looks professional or has exciting pictures.
• Training that shows kids to look for evidence, check the source, and compare with other sites makes them much better at spotting fake news.
• When children are exposed to obviously wrong claims and then asked to investigate, they become more careful fact‑checkers in later tasks.[[24]](https://ideas.repec.org/a/nat/nathum/v8y2024i12d10.1038_s41562-024-01992-8.html)

In other words, practice with tricky examples can make kids stronger, not more confused—if adults guide them well.

4.3 Lateral reading and "read, then check" habits

Media literacy experts describe a strategy called lateral reading: instead of staying on one site and scrolling down, you

• Open new tabs,
• Check what other people say about the site, and
• Look for independent, trustworthy sources.[[25]](https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3936112)[[26]](https://ctrl-f.ca/en/wp-content/uploads/2022/01/The-Digital-Media-Literacy-Gap.pdf)

Teacher guides based on this method have been used successfully with older students and adapted for younger learners using simplified steps like "Stop, Look, Check".[[27]](https://www.commonsense.org/education/articles/help-students-fact-check-the-web-like-the-pros)[[28]](https://www.edutopia.org/article/what-fact-checkers-know-about-media-literacy-and-students-should-too/)

5. A kid‑friendly toolkit for testing truth

Using all this research, we can build a step‑by‑step toolkit for 3rd–5th graders.

5.1 Step 1 – Name the claim

First, turn what you heard or read into a clear sentence.

• "My cousin saw a real dragon at the park" → Claim: Real dragons live at our local park.
• "This bracelet heals all sickness" → Claim: Wearing this bracelet cures any illness.

If you cannot say the claim in one clear sentence, you probably do not understand it well enough to check it yet.

5.2 Step 2 – Ask what type it is

• Is it trying to be a fact?
• Is it clearly an opinion?
• Is it pretend or a story?

If it is an opinion or pretend, you usually do not need to prove it true or false. You just need to understand it.
If it is a fact claim, move on.

5.3 Step 3 – Look for evidence

Use three main questions:

1. What is the proof?

• Photos, measurements, experiments, expert explanations, repeated observations.

1. Where did the proof come from?

• A random person online or a friend of a friend?
• A trusted source like a science museum, university, or well‑known news organization?

1. Does other evidence agree?

• Check at least two or three different good sources.

Studies on information literacy show that even elementary students can learn to look past flashy pictures and search for these deeper clues when teachers model it explicitly.[[20]](https://digitalcommons.uri.edu/jmle/vol15/iss2/3/)[[29]](https://eprints.qut.edu.au/244084/)

5.4 Step 4 – Try a test or thought‑experiment

If a claim is testable in real life, design a simple, safe experiment.

• Claim: "Plants grow better with music."

• Test: Grow two sets of plants, one with music and one without, and compare heights after a few weeks.
• Claim: "A heavier object always falls faster than a lighter one."

• Test: Drop a big and small object of similar shape from the same height and time their falls.

If you cannot test it directly, you can still run thought‑experiments in your mind using what you already know.

• If dragons really lived in the park, people would take photos, make news stories, and scientists would be extremely interested.
• If a bracelet truly cured all sickness, hospitals would study it, doctors would talk about it, and it would appear in serious medical research.

These kinds of reasoning show up in studies of how children test and revise their ideas about the world.[[8]](https://www.science.org/doi/10.1126/science.1223416)[[9]](https://pubmed.ncbi.nlm.nih.gov/23019643/)

5.5 Step 5 – Be ready to update your belief

Truth‑seeking is not about winning arguments. It is about getting closer to reality.
Researchers who study scientific reasoning describe good thinkers as people who:[[1]](https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.00459/full?TBiframe=true&width=921.6&height=921.6)[[2]](https://link.springer.com/article/10.1007/s11191-023-00460-5?error=cookiesnot_supported&code=4d321902-428b-4420-8c19-a3a97489b4f6)

• Change their minds when strong evidence appears.
• Explain why they changed, using clear reasons.
• Keep a little doubt, even when most evidence points one way.

You can model this:
"I used to think X, but now that I have seen Y and Z evidence, I think X is probably wrong and A is more likely true."

6. Classroom and family activities for truth detectives

Based on research‑backed lessons and curricula, here are activity patterns that fit well for 3rd–5th graders.[[14]](https://pz.harvard.edu/sites/default/files/NatureofScienceUnit.pdf)[[13]](https://nap.nationalacademies.org/read/11625/chapter/7)[[20]](https://digitalcommons.uri.edu/jmle/vol15/iss2/3/)[[29]](https://eprints.qut.edu.au/244084/)

6.1 Mystery box investigations (evidence quality)

Goal: Practice choosing tests that give strong evidence.

• Put different objects into closed boxes (like coins, marbles, cotton balls, LEGO bricks).
• Students can shake, tilt, and weigh the box but not open it at first.
• They list possible objects and describe which tests (listening to sounds, feeling weight, gently pressing) give the clearest clues.
• After they write their best claim and evidence, they open the box and compare.

This mirrors experiments researchers used to show that children notice which actions give more discriminating evidence.[[18]](https://www.nature.com/articles/s41467-021-23431-2.pdf?error=cookiesnotsupported&code=529b4b8b-d531-4d13-81fd-ed50d1819c2b)

6.2 Fact vs. opinion gallery walk

Goal: Strengthen the ability to sort statements.

• Hang statements around the room: some clear facts, some opinions, some tricky ones.
• Students move around with sticky notes labeled Fact, Opinion, or Unsure.
• They must write because… and give a reason (for example, "can be measured," "depends on taste," "from a trusted study").

This reflects research showing that 5–10‑year‑olds can already separate factual disagreements from preference disagreements when given practice.[[6]](https://columbiasamclab.weebly.com/uploads/5/9/0/6/59061709/heiphetzspelkeharrisbanaji2013_jesp.pdf)

6.3 Mini fact‑checking projects

Goal: Practice safe, simple media literacy.

• Give small groups a short claim, such as:

• "Goldfish have a memory of only 3 seconds."
• "People swallow 8 spiders a year in their sleep."
• "Lightning never strikes the same place twice."
• Students:

• Write the claim in a full sentence.
• Predict whether they think it is true and why.
• Use pre‑chosen kid‑safe sites (library databases, museum websites, fact‑checking sites) to investigate.
• Record what they find from at least two different sources.
• Finally, they label the claim true, false, or uncertain, explaining their reasoning.

Information‑literacy training like this has been shown to make students more successful at detecting fake science news and evaluating online information.[[22]](https://www.jdet.net/article/primary-school-pupils-ability-to-detect-fake-science-news-following-a-news-media-literacy-15963)[[20]](https://digitalcommons.uri.edu/jmle/vol15/iss2/3/)[[21]](https://escholarship.org/uc/item/9bh2z1q9)

6.4 Build‑your‑own experiment

Goal: Connect truth to hands‑on science.
Using guidance from science‑education research,[[15]](https://link.springer.com/article/10.1007/s10643-013-0579-4?error=cookiesnotsupported&code=48a57824-97b1-4320-8c69-30168a9d8a2e)[[30]](https://link.springer.com/article/10.1007/s12045-023-1623-3?error=cookiesnotsupported&code=e285a738-57e0-41ea-900b-3aeda81932f7)[[31]](https://psycnet.apa.org/doiLanding?doi=10.1037%2Fdev0000260) students:

1. Choose a testable question (for example, "Which paper towel absorbs the most water?" or "Does the angle of a ramp change how far a toy car goes?").
2. Plan their variables (what will change, what will stay the same).
3. Predict outcomes and explain why using prior knowledge.
4. Run the experiment and collect data.
5. Present their findings as a claim + evidence + reasoning.

This structure matches widely used "claim‑evidence‑reasoning" models that have been tested in classrooms.

7. Putting it all together – A story of two claims

Let’s watch our truth detective tools in action with two example claims.

7.1 Claim A – "This YouTube video proves that the Earth is flat."

1. Name the claim – The Earth is flat, not round.
2. Type – This is a fact claim about the real world.
3. Look for evidence –

• The video might show a person talking, some pictures, maybe a strange "experiment" with a camera.
• We ask: Is the experiment designed well? Does it control variables? Is the person an expert? Do other scientists agree?

1. Check other sources (lateral reading) –

• Search for information from space agencies, science museums, and astronomy textbooks.
• You find photos of Earth from many satellites, videos of astronauts going around the planet, and explanations of gravity and orbits.[[13]](https://nap.nationalacademies.org/read/11625/chapter/7)

1. Test the idea –

• If Earth were flat, ships would not disappear "bottom first" over the horizon.
• People in different parts of the world would not see different stars at night.

1. Conclusion –

• The flat‑Earth claim does not match the best evidence and does not cohere with centuries of scientific work.
• So we say it is false, even if the video looks confident or has many views.

7.2 Claim B – "This vaccine helps protect children from disease."

1. Name the claim – A specific vaccine lowers the risk of a specific illness.
2. Type – This is also a fact claim.
3. Look for evidence –

• We search medical research, health‑organization sites, and data dashboards.
• We find charts showing infection rates before and after vaccine programs, along with careful studies comparing vaccinated and unvaccinated groups.[[19]](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0140658)

1. Check other sources –

• Many independent groups (universities, hospitals, global‑health organizations) repeat similar results.[[19]](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0140658)

1. Test the idea –

• Over time, places with strong vaccination programs see big drops in certain diseases.
• When vaccination rates fall, those diseases often return.

1. Conclusion –

• While no vaccine is perfect, the claim that vaccines reduce certain illnesses is well supported by large amounts of evidence and fits with what we know about germs and the immune system.
• So we treat this claim as true enough to act on when making health decisions.

8. How families and teachers can support young truth detectives

Research on education and critical thinking suggests several practices that help kids grow into strong truth‑seekers:[[1]](https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.00459/full?TB_iframe=true&width=921.6&height=921.6)[[3]](https://www.ejsee.com/download/critical-thinking-in-national-primary-science-curricula-13271.pdf)[[32]](https://www.amacad.org/publication/education-and-civil-society-teaching-evidence-based-decision-making/section/7)[[14]](https://pz.harvard.edu/sites/default/files/NatureofScienceUnit.pdf)[[20]](https://digitalcommons.uri.edu/jmle/vol15/iss2/3/)

1. Model curiosity, not certainty.

Say things like, "I am not sure; let’s find out," and show how you search and compare sources.

1. Praise careful thinking, not just correct answers.

Celebrate when kids ask good questions, change their minds for good reasons, or notice weak evidence.

1. Provide safe practice with "tricky" information.

Use kid‑friendly fake news examples or obviously wrong myths, then guide students in debunking them using the toolkit.

1. Connect truth‑seeking to kindness.

Explain that we care about truth not to embarrass people, but to keep everyone safer and to make fair decisions.

1. Build habits, not one‑time lessons.

Use the language of claims, evidence, and reasoning in many subjects: science, history, even lunchroom debates.
When adults and kids work together this way, truth is not just a hard idea from philosophy class. It becomes a daily habit of listening carefully, checking evidence, and being brave enough to change your mind.
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9. Short episode overview (for the database)

In this episode of the PEZ podcast, we become "truth detectives" and explore the big question: What makes something true? Aimed at 3rd–5th graders, the episode helps kids tell the difference between facts, opinions, and pretend, and shows how scientists use questions, experiments, and evidence to figure out what is really going on in the world. Through mystery‑box investigations, mini fact‑checking missions, and kid‑sized science experiments, listeners learn simple steps for testing wild claims they hear from friends, videos, or the internet. By the end, kids will have a friendly toolkit for checking information, spotting fake or misleading stories, and changing their minds when new evidence appears—just like real scientists and researchers.