What Should Be Left Out of the Science Curriculum? A Teacher’s Honest Take
“Okay, so who can tell me what the mitochondria does?”
I was standing at the front of my seventh-grade classroom, holding a worksheet with a diagram of an animal cell. A few hands went up. One boy said, without much enthusiasm, “It’s the powerhouse of the cell.” The rest of the class nodded along like they’d heard it so many times they’d stopped hearing it at all.
“Right,” I said. “And why is that important?”
Silence. The boy who answered looked down at his desk. A girl in the back raised her hand slowly and asked the question I’d been waiting for: “Is this going to be on the test?”
I told her yes, probably. She wrote something down. I moved on.
That moment has stayed with me because it wasn’t bad teaching, exactly. It was normal teaching. But somewhere in that exchange, science had turned into a list of facts to be stored and retrieved, and the kids knew it. I couldn’t blame them. I was the one handing them the list.
A few weeks later, everything was different.
We were supposed to be starting a unit on ecosystems. I had a neat PowerPoint about food chains, predator-prey relationships, and the difference between biotic and abiotic factors. But before I could open it, one of my students came running in from recess holding a small cardboard box. “I found something,” she said. Inside was a fuzzy green caterpillar, inching its way across a piece of bark.
Within minutes, half the class was crowded around her desk. Someone asked what it was. Someone else said it would turn into a moth. Another kid said no, it was definitely a butterfly. They started debating what it ate, where it slept, and whether it was lost. No one asked if it would be on the test.
I closed my laptop. We spent the next twenty minutes just watching it move.
That caterpillar did more for science class than my carefully planned lesson ever could have. The kids were asking genuine questions—questions they actually wanted answers to. And the only thing I had to do was let them.
This is what I’ve been thinking about a lot lately: what are we actually doing in science class, and why?
If I could choose what to leave out of the science curriculum, I’d start with the things we teach before students have any reason to care about them. The names of cell organelles. The layers of the Earth. The stages of the rock cycle. The classification system with kingdom, phylum, class, order, family, genus, species. So much of that material gets taught in middle school because it’s always been taught in middle school, not because it makes sense developmentally. Kids memorize the word “homeostasis” but have no idea what it feels like when they’re shivering or sweating. They can label a diagram of the water cycle but can’t tell you where the water in their tap comes from.
I’m not saying we should never teach those things. But we’re so afraid of leaving something out that we end up covering everything and knowing nothing. The curriculum is a mile wide and an inch deep, and teachers feel pressured to race through units so we can say we “got through” chapter twelve by June.
What I’d include instead is more time for observation, questions, and messy investigation.
That seems obvious, but it’s not easy to do. Real science is slow. It’s failure. It’s trying something, noticing that it didn’t work, and trying something else. That doesn’t fit neatly into a 45-minute period or a marking period or a standardized testing schedule. So we cut it out. We give kids the results of experiments instead of the experiment itself. We show them a video of a chemical reaction rather than letting them mix things together in a plastic cup.
We’re terrified of mess. I get that. I have twenty-eight students and one hour. I understand why it feels safer to hand out a worksheet.
But if we’re honest about what science actually is, it’s not memorizing facts. It’s a habit of mind. It’s learning to look carefully at the world and ask, “What’s going on here?” It’s being able to change your mind when the evidence changes. That’s a skill beyond the classroom. That’s how you decide whether to trust a headline about a new study, or whether that miracle weight-loss product is actually nonsense.
I think we should teach students how to read a graph before we make them memorize the periodic table. I think we should teach them what a claim is, and why some claims need more evidence than others. We should show them how to spot a bad sample size, or a correlation that isn’t a cause, or an ad disguised as research.
Those are skills they’ll use whether they grow up to be scientists or not.
That doesn’t mean we throw out content entirely. Learning about the solar system, the human body, and the basics of chemistry gives us shared language. But we need to be more honest about what matters. Do I need my students to memorize every element symbol by Friday? No. Do I need them to understand that the periodic table is organized by repeating patterns, and that those patterns help predict how atoms behave? Yes. That concept is something you can teach with a simple activity and a conversation. It doesn’t require flashcards.
I still teach some memorization, but I teach it differently. The powerhouse of the cell line is fine as a hook, but it shouldn’t be the destination. Instead of asking students to list the parts of a cell, I could give them a scenario: “You’re a tiny repair robot entering a cell. Something is wrong—the cell can’t make enough energy. Which organelle would you go check first?” That question asks them to understand a structure’s function, not just its name. It’s a small change, but it makes the fact meaningful.
Practical changes like that matter more than dramatic curriculum overhauls.
I’ve also started to be more honest with my students when I don’t know the answer. For years I thought I needed to have all the answers, or at least look like I did. But when I admitted, “Actually, I’m not sure why the caterpillar moved like that. Let’s see if we can figure it out,” the whole room perked up. They appreciated being part of the investigation instead of being fed a conclusion. That moment of not-knowing became the most valuable teaching tool I have.
I think parents can help with this, too. At home, you can resist the urge to turn every nature walk into a lesson. You don’t have to name every bird. You can just sit outside and ask your child what they notice. If they ask a question you can’t answer, say so. Look it up together. That models scientific thinking far better than a memorized fact ever could.
There are definitely things I’d cut from the science curriculum if I had the power. The annual egg drop project, for one. All due respect to egg drop, but there are better ways to teach engineering and physics that don’t involve raw eggs on the gym floor. I’d cut the obsession with lab reports formatted exactly one way. I’d cut the practice of assigning “bonus” research projects about famous scientists every February.
I’d also cut the unnecessary vocabulary. Every subject has its own jargon, but science is especially bad about giving kids twenty new words a week and expecting them to keep up. Vocabulary should come after understanding, not before it. Let the students see the phenomenon first. Let them describe it in their own words. Then introduce the term that helps them communicate with the rest of the world.
I’m not saying we don’t need standards. I’m just saying we need to make room for the moments that can’t be planned.
That caterpillar stayed in my classroom for two days. The kids named it. They brought it fresh leaves. They argued about what kind of moth it would become. On the third day, they decided it should probably be set free near where they found it. We walked outside, opened the box, and watched it crawl onto a branch. Then we went back in and I pulled up the ecosystem PowerPoint, which I ended up condensing because we’d already spent the week actually observing how a living thing depends on its habitat.
I don’t know if every day can be that kind of science class. I doubt it.
But I do know that the kids are still talking about that caterpillar, and I can’t remember whether the PowerPoint ever got finished.
Please indicate: Thinking In Educating » What Should Be Left Out of the Science Curriculum