Strange But True Science: How to Use 2 Truths and a Lie to Build Curiosity, Collaboration and Scientific Thinking
Science lessons do not always need to begin with a worksheet, a set of notes, or a carefully labelled diagram. Sometimes, a much better starting point is a statement that makes a student say, “Wait... that's actually true?”
That moment of surprise can be extremely useful in a science classroom.
Strange but true science facts and 2 Truths and a Lie activities give teachers a simple way to introduce curiosity, discussion, collaboration and scientific reasoning into almost any science topic. Students are presented with unusual scientific claims, surprising facts or three statements where one is false. Their job is not simply to guess. They need to think, question, discuss, challenge one another and, ideally, explain why they believe something is true or false.
That makes these activities much more than a quick science game.
Used well, a Strange But True activity can become a science warm-up, lesson starter, review activity, discussion prompt, formative assessment, science literacy exercise, early-finisher task, sub plan or even the starting point for a much deeper investigation.
The basic idea is wonderfully simple: give students something surprising and give them a reason to talk about it.
Why surprising science facts work so well in the classroom
Students encounter an enormous amount of information every day. Some of it is accurate, some is oversimplified, some is misleading and some is simply wrong. Science education therefore involves more than remembering scientific facts. Students need to develop the habit of asking whether a claim makes sense, what evidence supports it and how confidently they should believe it.
A surprising fact provides a natural reason to practise those skills.
Imagine telling a class that some animals can have an enormous influence on an entire ecosystem. Rather than immediately explaining keystone species, food webs or invasive species, you can first give students several unusual examples and ask them what they think.
Or imagine beginning a chemistry lesson with three statements about states of matter. One sounds obviously correct. One sounds strange but plausible. The third sounds completely ridiculous.
Suddenly, students have something to investigate.
The important part is that the teacher does not need to turn the activity into a competition about who can guess the answer fastest. The real learning begins when students explain their reasoning.
“Why do you think that one is the lie?”
“What evidence would you want before believing it?”
“What makes that statement sound believable?”
“Does anyone disagree?”
“What scientific idea could help us decide?”
Those questions shift the activity from trivia towards scientific thinking.
How to run a 2 Truths and a Lie science activity
The familiar structure is simple. Students are given three statements. Two are scientifically accurate and one is false.
However, the way you run the activity can dramatically change the learning.
For a quick lesson starter, display the three statements and give students perhaps 30 seconds to think independently. Ask them to decide which statement they believe is the lie.
You can then have students compare their answers with a partner before revealing the answer.
That small pause for partner discussion matters.
Instead of immediately asking for the answer, ask students to explain their reasoning to someone else. A student who initially thinks, “Number two is obviously false,” now has to put that thought into words.
You can then ask pairs to share their reasoning with the class.
For older students, I particularly like asking them to give a confidence score as well as an answer. They might say, “We think statement three is the lie, but we're only 60% confident.”
That introduces a surprisingly valuable scientific habit: being willing to distinguish between what you know and what you merely suspect.
You can also deliberately allow disagreement. If one group thinks statement one is false and another thinks statement three is false, do not rush to correct them. Ask both groups to defend their reasoning.
The classroom becomes a miniature scientific discussion.
Make students defend the answer, not just guess it
This is probably the single most important change I would recommend.
If students receive points simply for identifying the lie, you have created a guessing game.
If students receive credit for making a reasonable scientific argument, you have created a learning activity.
For example, instead of:
“Which statement is the lie?”
try:
“Which statement is the lie, and what makes you think so?”
Then take it a step further:
“What scientific knowledge could you use to test your decision?”
This encourages students to draw upon what they already know. Sometimes they will be correct for the wrong reason, which is particularly useful information for the teacher.
That makes 2 Truths and a Lie useful as a form of formative assessment.
You can quickly discover that students understand the basic idea of a concept but have a misconception about one particular part of it. You can then use that misconception as the bridge into the lesson.
Use Strange But True facts when you want wonder without competition
2 Truths and a Lie is not the only way to use surprising science.
Sometimes there is no need for a lie at all.
A single genuinely unusual scientific fact can be an excellent lesson opener.
Show the fact. Give students a moment to react. Then ask them what questions it makes them wonder about.
For example:
“How can that happen?”
“Why would that be useful?”
“What would we need to measure?”
“Could this happen somewhere else?”
“What scientific concept might explain it?”
This changes the activity from “Can you get the right answer?” to “What can you do with this information?”
That is particularly useful when introducing a new topic because students do not need to know much in advance. Their questions become the starting point.
A Strange But True fact about space might lead into gravity, orbital mechanics or engineering. A surprising fact about animals might lead into ecosystems and evolution. A strange fact about the human body might lead into anatomy, physiology or health. A surprising observation about matter might become an entry point into particle theory.
The fact is not the destination. It is the spark.
Turn the classroom into a team of science detectives
One of my favourite ways to run these activities is to tell students that they are temporarily becoming science detectives.
Give groups three statements and tell them that they have to investigate the evidence using what they already know.
There is one useful twist here: do not necessarily allow them to immediately Google the answer.
If students can search for the exact sentence, the activity can become a reading exercise rather than a reasoning exercise.
Instead, give them a few minutes to discuss what they know and what clues they can identify. Then reveal the answer and explain the science.
You can subsequently allow students to research the claim if you want to turn the activity into a science literacy exercise.
This produces two different learning stages.
First: “What do we think?”
Second: “What does the evidence tell us?”
That distinction is valuable because science is not about being right immediately. It is about changing your confidence when better evidence becomes available.
Give every student a role in the discussion
Group work does not automatically produce collaboration.
Put four students around a table and there is always a possibility that one student will do the thinking, another will confidently announce an answer, another will agree with them and another will quietly wait for it to be over.
A simple solution is to give students different responsibilities.
One student can be the initial decision-maker. Another can be responsible for challenging the group's reasoning. Another can look for evidence from previous lessons. Another can report the group's final argument.
The roles can rotate between questions.
You can also use a “disagree before you decide” rule. Before the group settles on an answer, one person has to explain why another option might actually be correct.
This sounds simple, but it creates a useful classroom culture. Students learn that disagreement is not necessarily a problem. It can be part of the process of thinking scientifically.
Let students create their own 2 Truths and a Lie
Once students understand the activity, turn the responsibility over to them.
Ask each pair or small group to create three statements about the current science topic. Two must be true and one must be false.
The real challenge is creating a convincing lie.
A terrible lie is easy to identify and does not require much thought. A good lie should sound scientifically plausible.
That means students need to understand the science well enough to manipulate it.
For example, a student who understands states of matter might create a false statement that confuses temperature with particle movement. A student who understands ecosystems might create a believable claim about predator populations. A student studying space might create a statement that sounds reasonable about astronauts, rockets or planetary exploration.
This makes creating the activity almost as valuable as completing it.
Students are not simply recalling information. They are thinking about how scientific claims are constructed.
You can then swap the student-created questions between groups. Each group attempts to identify the lie and explain its reasoning.
The original authors can then reveal the answer and explain the science behind all three statements.
Use the activity before teaching a topic
There is no rule saying students need to know the answers before you use 2 Truths and a Lie.
In fact, using it before instruction can be extremely useful.
Give students three statements about an upcoming topic and ask them to make their best judgement.
You now have a snapshot of their existing knowledge.
More importantly, you have created curiosity.
If students believe that something is true and later discover that it is not, they have a reason to pay attention to the explanation. If they encounter a surprising fact that they correctly identify, they may want to understand how they knew.
This makes the activity particularly effective as a bridge into a new unit.
It can also be used after teaching as a review. In that case, students have the opportunity to retrieve information from memory and identify misconceptions that remain.
Use it across biology, chemistry, physics, Earth science and space
One of the strengths of Strange But True and 2 Truths and a Lie activities is that the format does not belong to one particular branch of science.
In biology, surprising facts can introduce human body systems, reproduction, ecology, evolution, cells or health.
For example, a pregnancy activity can provide an unusual route into human reproduction, cell division, hormones, development and anatomy. A ready-made Pregnancy Strange But True Facts and 2 Truths & a Lie activity set includes separate Strange But True and 2 Truths and a Lie formats, including digital and printable versions.
For ecology, surprising examples of animals changing their environments can lead into food webs, population dynamics, invasive species and ecosystem interactions. The Animals Impacting Ecosystems Strange But True Facts and 2 Truths & a Lie activity is designed around exactly this sort of discussion, with facts, believable lies and several presentation formats.
Chemistry works particularly well because students often have strong everyday assumptions about materials. Ask them what they think they know about solids, liquids, gases and phase changes, then challenge those assumptions. The States of Matter Strange But True Facts and 2 Truths & a Lie activity provides a ready-to-use example with digital slides, presentation material and a printable version.
Physics offers enormous opportunities for surprising claims. Magnets and magnetic levitation, for instance, provide an excellent mixture of familiar experiences and genuinely strange behaviour. The Magnets and Mag-lev Trains Strange But True Facts and 2 Truths & a Lie activity uses that combination to introduce magnetic phenomena, magnetic levitation and superconductors while encouraging students to question and defend their thinking.
Earth science can benefit from exactly the same approach. Carbon, nitrogen and water cycles are important, but they can sometimes become a sequence of diagrams and arrows. Surprising facts can make those enormous systems feel much more concrete. The Earth Cycles Strange But True Facts and 2 Truths & a Lie activity focuses on the carbon, nitrogen and water cycles and can be used as a lesson opener, review activity or collaborative task.
And, of course, space science is almost unfairly well suited to this teaching strategy.
Students already expect space to be strange. The challenge is helping them distinguish genuine scientific oddities from things that merely sound like science fiction. The Space Exploration Strange But True Facts and 2 Truths & a Lie activity uses surprising facts about rockets, space stations, planetary exploration and telescopes to encourage students to evaluate claims and discuss the science behind them.
Human biology provides another particularly rich area because students can connect the science to their own bodies. A Human Body Systems Strange But True Facts and 2 Truths & a Lie activity can be used to introduce or review human body systems while giving students an unusual angle from which to think about familiar biological processes.
Three ways to fit the activity into a normal lesson
You do not need a whole lesson for this.
A five-minute version works beautifully as a bell-ringer. Display three statements as students arrive, let them make an individual decision, then discuss their reasoning with a partner before revealing the answer.
A ten-minute version can become a more substantial collaborative activity. Give groups several sets of statements, require them to record their choice and reasoning, and then have groups compare answers.
A longer version can become a science literacy lesson. Students decide which statement is false, justify their reasoning, reveal the answer, research the underlying science and then create their own three statements for another group.
The same resource can therefore be used repeatedly without necessarily feeling like the same activity.
That flexibility is especially useful for teachers because sometimes you have five spare minutes at the beginning of a lesson and sometimes you suddenly discover that the planned activity took half the expected time.
Try a “fact of the day” routine
Another simple approach is to use one Strange But True fact regularly.
You could have a “Science Fact of the Day” displayed as students enter the classroom.
Do not immediately explain it.
Give students a minute to discuss it.
Ask them whether they believe it, what questions they have and what evidence they would need to confirm it.
Then reveal the explanation.
Over time, this creates a classroom expectation that science contains unexpected things worth noticing.
It also gives you a low-pressure opportunity to expose students to science beyond the narrow sequence of the curriculum. A fact about an unusual organism might lead to ecology. A fact about a historical scientist might lead to scientific discovery. A strange astronomical observation might lead into physics. A medical fact might lead into health science.
The curriculum remains important, but students also get to see that science is much bigger than the next assessment.
Make the lie believable
If you are creating your own 2 Truths and a Lie activities, the quality of the lie matters.
The best lies are not random nonsense.
They should exploit a misconception, a common assumption or a subtle difference between two related scientific ideas.
For example, a believable false statement might take a true scientific idea and change one important detail. Students then need to recognise the distinction.
This can be especially powerful with older students because it requires a more precise understanding of the science.
A good question to ask when writing your own activity is:
“Would a student who only half-understands this topic find this believable?”
If the answer is yes, you probably have a useful lie.
You can also deliberately write lies that are tempting because they sound like something students have heard before. This turns the activity into an opportunity to uncover misconceptions rather than simply testing recall.
Don't forget the explanation after the reveal
The reveal should never be the end.
Once students discover the lie, spend a little time explaining why it is false and why the other statements are true.
This is where the actual science learning happens.
Ask students to restate the explanation in their own words. Ask what misconception the lie relied upon. Ask whether there was any evidence in the wording that should have made them suspicious.
You can even ask students to write a one-sentence correction of the false statement.
That final step is particularly useful because it requires students to move from recognition to explanation.
The activity becomes:
Predict → Discuss → Justify → Reveal → Explain → Correct
That is a much richer learning sequence than simply:
Guess → Answer
How to adapt Strange But True activities for upper elementary
Although the format works particularly well with middle and high school science, it can be simplified for younger learners.
Use shorter statements, more concrete vocabulary and topics that students can visualise. Animals, the human body, space, weather, materials and Earth science can all work particularly well.
You can also reduce the emphasis on defending an answer with formal scientific vocabulary. Younger students might simply explain, “I think this is false because...” and then compare their thinking with another group.
The goal at this level is less about sophisticated scientific argument and more about building the habits of curiosity, questioning and explaining.
Why I like these activities as a science teacher
There is a practical reason I keep coming back to this type of activity.
It is relatively easy to prepare, but it does not have to feel like a low-value filler.
A good set of statements can make students laugh, disagree, question what they thought they knew and ask surprisingly good questions.
It also gives the teacher something valuable that a conventional worksheet does not always provide: a window into student thinking.
You can hear the misconceptions.
You can hear the reasoning.
You can hear students changing their minds.
And that is where some of the best science learning happens.
The goal is not to turn every science lesson into a game. It is to use a little surprise strategically.
A strange fact can create curiosity.
A believable lie can create uncertainty.
A disagreement can create discussion.
A request for evidence can create scientific reasoning.
And an explanation can turn all of that into learning.
Ready to bring more surprising science into your classroom?
If you want to create these activities yourself, the format is simple enough to build around almost any topic you teach. Choose a handful of genuinely surprising facts, create a few plausible misconceptions or false statements, and make students explain their thinking rather than simply selecting an answer.
If you would rather have the content ready to use, I have created a growing collection of Strange But True Facts and 2 Truths & a Lie science activities covering biology, chemistry, physics, space, Earth science and health. The resources are designed to be flexible enough for lesson starters, collaborative activities, review, extension work, sub plans and those occasional lessons where you need something useful with very little preparation.
If you are not sure where to start, you can also download my free Teaching Astrophysicist Resource Catalogue. It provides a regularly updated overview of the wider collection, including free resources, and is designed to make it easier to find resources across middle and high school science and mathematics.
The important thing is not whether you use a particular resource, though.
It is the teaching move behind it.
Give students something surprising.
Give them time to think.
Give them a reason to talk.
Ask them to explain.
And let the science do the rest.
Sometimes one strange little fact is enough to turn a routine science lesson into a room full of students asking, “Wait... how is that possible?”
Thanks for reading
Cheers and stay curious
Oliver - The Teaching Astrophysicist
