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Think For Yourself

Getting It From the Source: Primary vs Secondary

Ages 12–16 25 min read Intermediate

In History, we learned about primary and secondary sources as records of past events. But the concept applies to everything you research — health claims, news stories, science, politics.

The closer you get to the original source, the more accurate your understanding.

The Source Chain

Information degrades as it passes through layers:

  1. Original source: A scientific study, an official document, raw data, a direct witness
  2. Analysis: An expert interpreting the original (journal article, textbook)
  3. Reporting: A journalist summarising the analysis (news article)
  4. Social sharing: Someone's summary of the news article (tweet, post)
  5. Chinese whispers: Someone's memory of what they saw on social media

By level 5, the original information may be unrecognisable.

A Real Example

In 2020, a study found that hydroxychloroquine showed some effect against COVID-19 in lab conditions (in a petri dish). Here's what happened to that information:

  • Study: "In vitro activity observed" (very limited claim)
  • Science news: "Drug shows promise against COVID"
  • Mainstream news: "Potential COVID cure found"
  • Social media: "THEY'VE FOUND THE CURE!"

Each step amplified the claim far beyond what the evidence supported. The original study said nothing about curing humans.

How to Trace Back to the Source

  1. When you see a claim, ask: "What's the original source?"
  2. Follow the links. News articles should link to or name their source.
  3. If there's no source cited, be suspicious.
  4. Read the original. Does it actually say what the headline claims?
  5. Check the methodology: how was the research done? How many people? Who funded it?

Tonight's Question

"Pick a health or science claim you've seen recently. Can you trace it back to its original source? Does the source actually say what the headline said?"

Source Chain Challenge

  1. Find a news article that references a study or report.
  2. Trace the claim back through the chain: article → source → original data.
  3. At each step, note what was added, removed, or changed.
  4. Rate the headline: accurate, slightly misleading, or completely wrong?
  5. Discuss: why do headlines exaggerate? Who benefits?

Go Further

  • Tool: Google Scholar (scholar.google.com) — search for academic papers directly.
  • Research: What is "peer review" and why does it matter?
  • Book: Bad Science by Ben Goldacre (2008) — how media distorts scientific research.
  • Challenge: Pick any health claim you've heard. Can you find the original study? Does it support the claim?

What We Simplified

  • Not everyone can read original studies. Academic papers are often behind paywalls and written in technical language. Good science journalism is genuinely valuable.
  • The hydroxychloroquine story was more complex. Multiple studies were conducted with varying results. We simplified for illustration.
  • Primary sources can be wrong too. Studies can be poorly designed, biased, or fraudulent. No single source should be trusted absolutely.

Sources

  • Goldacre, B. (2008). Bad Science. Fourth Estate.
  • Ioannidis, J.P.A. (2005). "Why Most Published Research Findings Are False." PLoS Medicine, 2(8), e124.
  • Cochrane Library. "About Cochrane Reviews." Cochrane

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