Why Do Scientists Study Things They Can’t See? Lessons From the 2026 Nobel Prize in Physics

When I talk to children about science, I sometimes hear the same question: “But how do scientists know it’s there if they can’t see it?

It is a wonderfully simple question, and I think adults sometimes underestimate how important it is.

We are used to seeing science presented as a collection of facts: planets orbit the Sun, atoms make up matter, electricity flows through circuits. But real science is rarely that straightforward. Scientists often begin with something they cannot see directly. They notice an unexpected pattern, collect evidence, build an experiment, and slowly work out what might be happening.

The 2026 Nobel Prize in Physics offers a particularly good example.

This year’s prize recognized Francis Halzen for his pioneering contributions to neutrino astronomy and the development of the IceCube Neutrino Observatory. Neutrinos are extremely difficult to detect. They have no electric charge, interact only very weakly with matter, and enormous numbers of them pass through Earth constantly.

At first glance, that sounds like an unlikely subject for decades of scientific work. Why spend so much time studying something that is almost impossible to see? That is exactly where educational value begins.

The Science of Seeing Without Looking

Imagine telling a child that billions of tiny particles are passing through their body right now. The natural reaction is probably disbelief.

“Can I see them?”

“No.”

“Can I feel them?”

“No.”

“Then how do we know they’re there?”

That last question is the interesting one.

Scientists don’t need to see a neutrino directly in the way we see a ball or a tree. Instead, they look for the effects produced when neutrinos interact with matter.

The IceCube Neutrino Observatory, built deep in the Antarctic ice, uses thousands of light-sensitive detectors to capture tiny flashes of light produced when neutrinos interact with the ice. From those signals, scientists can work backward to learn about the particles that produced them. I think this is one of the most important ideas we can teach children about science:

Evidence does not always look like the thing you are studying.

A student cannot see gravity, but they can watch a ball fall.

They cannot see air, but they can watch a balloon move.

They cannot see sound waves, but they can observe a speaker vibrating.

And scientists cannot simply look at a neutrino. They have to look at what happens when it interacts with the world.

That is a very different way of thinking from simply memorizing scientific facts.

A Child Asking “How Do You Know?” Is Already Thinking Like a Scientist

As an educator, I have learned to pay attention when a child keeps asking “why” or “how do you know?”Sometimes adults interpret repeated questions as a sign that a child is distracted or being difficult. I see them differently. A child who asks, “How do you know?” is beginning to distinguish between a claim and evidence. That distinction becomes increasingly important as children grow older.

Consider a simple classroom experiment.

A teacher puts two identical plants near a window. One receives regular water, while the other receives very little. After several weeks, the plants look different.

A student might say:

“The first plant grew better because it got more water.”

That is a reasonable hypothesis.

But another student might ask:

“How do we know it was the water? What if one plant got more sunlight?”

That second question is even more valuable.

The student is beginning to think about variables, alternative explanations, and evidence.

That is scientific thinking. The same habit of mind eventually allows scientists to study things as difficult to observe as neutrinos.

Why Scientists Don’t Give Up When the Evidence Is Difficult

One thing I find particularly inspiring about neutrino research is the sheer patience involved.

Modern neutrino astronomy did not appear overnight. Scientists had to develop new detectors, find places where extremely sensitive instruments could operate, analyze enormous amounts of data, and distinguish meaningful signals from background noise.

There were many opportunities to decide that the problem was simply too difficult.

But science often moves forward precisely because someone is willing to stay with a difficult question longer than most people would.

This is something I wish we talked about more often with students.

We tend to celebrate the moment when someone gets the answer.

But in real scientific work, there can be years when the answer remains unclear.

A student who spends twenty minutes struggling with a math problem may feel that they are failing because they haven’t solved it yet.

A scientist can spend years investigating a question without knowing whether the experiment will produce the expected result.

The difference is not that scientists never struggle.

It is that they learn to treat uncertainty as part of the process.

“I Don’t Know Yet” Is a Powerful Sentence

In classrooms, there is often pressure to produce the correct answer quickly. I understand why. Teachers have limited time, students have assignments to complete, and assessments require measurable answers. But I sometimes worry that we unintentionally teach children that not knowing something is a weakness.

Science tells us almost the opposite.

“I don’t know yet” can be the beginning of an investigation.

When a child asks why the Moon appears to change shape, we don’t want to give them only the answer. We want them to observe it over several nights.

When they ask why some objects sink and others float, we can let them make predictions before testing them.

When they ask whether something invisible can really exist, we can show them how scientists use indirect evidence.

The important lesson is not simply that neutrinos exist.

It is that our knowledge of the world can grow even when direct observation is impossible.

What the Neutrino Story Teaches Us About Learning

I think this has an important connection to the way we teach science in elementary and middle school. Too often, science education can become a sequence of definitions. Students memorize the names of particles, layers of the Earth, types of energy, or stages in a biological process, they may perform well on a test but still have little understanding of how scientists actually know these things. A better approach is to start with the puzzle.

How could you prove that something invisible exists?

Let students make guesses.

Some might say you need a special camera, others might suggest looking for movement or changes in another object. Then the teacher can introduce the idea of indirect evidence. Suddenly, neutrinos are no longer just another unfamiliar scientific term. They become the solution to a fascinating problem.

That shift matters.

When students understand the question that led to a discovery, scientific knowledge becomes something people figured out, rather than something they were simply told.

We Should Give Children More Unanswered Questions

If there is one lesson I would take from this year’s Nobel Prize in Physics and bring directly into a classroom, it would be this:

Don’t be too quick to answer every question.

Sometimes the best thing a teacher can do is give students a problem that is slightly beyond what they already know and let them sit with it.

Ask:

• How would you detect something you cannot see?
• How could you prove that an invisible force exists?
• What evidence would convince you that your explanation is wrong?

Those questions do not have to lead immediately to a complicated experiment. They simply teach children that knowledge is built through questioning, observation, evidence, and revision. And that may be more valuable than memorizing another scientific definition.

The story of neutrinos reminds me why I love science education in the first place. The universe is full of things we cannot see directly, and yet human beings have developed astonishing ways to understand them.

A child does not need to become a physicist to appreciate that.

They only need to keep asking one very simple question:

“How do we know?”

That may be one of the most important questions we can teach a child to ask.

Simon Holmes | Contributing Education Reporter

Simon Holmes is an education reporter who contributes to WuKong Education, covering K–12 education, education technology and issues affecting students and families around the world.

With a background in education and experience as a teacher, Simon brings firsthand insight into classroom learning, student development, and the challenges educators face.

For WuKong Education, he reports on education research, emerging learning trends, policy developments, technology in the classroom, and issues relevant to parents, teachers, and students.