The laboratory I returned to was not the laboratory I remembered

Between school biology, DNA sequencing, and a research career still waiting to happen

The first thing that surprised me when I returned to university was not a sophisticated laboratory instrument. It was the students.

Many of them were considerably younger than I was. I had already spent years teaching biology, preparing lessons, marking assessments, managing classrooms, and trying to help students with very different abilities. Suddenly, I was sitting among students who belonged to another generation, asking questions and trying to learn again.

For a moment, the distance between us felt enormous.

Then something unexpected happened. I began to enjoy being a student again.

I wanted to examine every instrument, understand how it worked, discover its limitations, and learn where mistakes could enter an experiment. I was curious in a way that reminded me of my earliest university years.

But I should explain why I returned in the first place.

The truth about why I went back

It would be easy to say that I pursued a Master’s degree because of my lifelong passion for science. That would be true, but incomplete.

I was also exhausted.

Teaching is a demanding profession, and much of its work is invisible to people outside the classroom. There are lessons to prepare, assessments to design, paperwork to complete, classrooms to manage, and students who need different kinds of support. You must challenge those who are doing well without leaving behind those who are struggling.

I had been teaching biology for years. I valued the work, but I could not ignore how tiring it had become.

Long before I became a schoolteacher, I had studied biology with a specialization in biochemistry. Like many students in my field, I had imagined a future in laboratories, research institutions, or scientific industries. Teaching was not the only career I had pictured for myself.

Returning to university was partly an attempt to recover that earlier ambition. It was also a response to a problem I had noticed in my classroom.

The biology we teach in schools has changed.

Students encounter increasingly sophisticated concepts, from cellular respiration and molecular biology to the principles behind DNA sequencing. A teacher may know how to explain the Krebs cycle or the Bohr and Haldane effects, but knowing the textbook explanation is not quite the same as understanding how scientists investigate the underlying processes.

I began to feel that my students deserved more than definitions and diagrams. I wanted to show them where scientific knowledge comes from.

And I knew I needed to learn more myself.

A laboratory that had changed its language

When I first studied at university, much of our laboratory work relied on manual techniques. Computers were not integrated into many of the instruments we used. Where they were available, their role was often limited to recording results or processing data in spreadsheets.

The laboratory I returned to was different.

Modern instruments could generate enormous quantities of digital information. Understanding their output required familiarity not only with laboratory procedures but also with software, databases, computational analysis, and statistics.

Learning to operate an instrument was no longer enough.

I needed to understand what happened to the data afterward. How were sequences compared? What assumptions did the software make? How reliable was an apparent match? What did the analysis reveal, and what could it not tell us?

From sequence alignment and biological databases to statistical tools and Oxford Nanopore sequencing, each answer seemed to produce another question.

It felt as though I was learning two sciences at once: biology, which I had studied for years, and the computational language through which so much modern biology is now understood.

There was a challenge behind every challenge.

Strangely, I enjoyed it.

When a sequence is not yet an answer

My Master’s research brought me into contact with questions of particular clinical importance: the potential use of DNA sequencing to investigate bloodstream infections in premature newborn infants.

The prospect was compelling. Sequencing technologies can detect microbial genetic material, including signals that conventional approaches may not readily reveal. But the excitement of seeing a microbial name appear in an analysis must be balanced by a more difficult question.

What does that result actually mean?

In low-biomass samples, where very little microbial DNA may be present, contamination and other technical factors can complicate interpretation. Detecting a sequence does not automatically establish that an organism was present in the patient’s bloodstream, much less that it caused an infection.

I came to appreciate that a sophisticated instrument does not eliminate uncertainty. Sometimes it gives us more information than we are immediately able to interpret.

That lesson matters far beyond any one sequencing platform. Technology can make observations possible, but scientific judgment is still needed to decide what those observations support.

I remain proud of the research and grateful for the people who helped me complete it.

Dr. Hadi Yassine and Dr. Fatiha Benslimane were among the academics whose support and encouragement I deeply appreciated during my scientific journey. I am grateful, too, to the colleagues, lecturers, and friends who helped make returning to academic study possible.

Research may depend on instruments and data, but it also depends on people willing to share their knowledge.

The result I did not expect to find in a classroom

Something changed when I returned to teaching.

I had been explaining some biological concepts since 2013. The subjects were familiar, and I knew how to present them. But after my laboratory experience, I noticed a difference in the way I spoke about science.

When I introduced a technique, I could describe the instrument behind it. I could explain what happened to the sample, why a researcher performed a particular step, and where difficulties might arise.

I was no longer relying solely on descriptions I had learned from books. I could bring my own experience into the explanation.

And the students seemed to notice.

When I described an experiment step by step, I could see them becoming more attentive. They followed the procedure with curiosity. They seemed to imagine the instruments, the samples, and the researcher making decisions along the way.

For a few minutes, I felt I could transport them from their classroom desks into a university laboratory without anyone leaving the room.

That was one of the most rewarding surprises of my Master’s degree.

The laboratory had made me a different kind of teacher.

But I do not want to turn that observation into a sentimental ending.

The dream I have not abandoned

Almost two years have passed since I completed my Master’s degree.

Sometimes I still look at the cover of my printed thesis.

I feel an enormous sense of pride.

Not because I believe the research answered every question, or because earning the degree made me an expert in everything I wanted to learn. I feel proud because I returned to university after many years, faced unfamiliar technologies, and completed a demanding scientific project.

And yet, there is another truth I do not want to hide.

If I were offered a stable position in a research laboratory, with the opportunity to grow professionally and contribute to meaningful scientific work, I would seriously consider leaving teaching.

That does not diminish my respect for my students or for education. It simply acknowledges something I have felt for a long time: teaching is important, but it is not the only future I want for myself.

I still hope to pursue a PhD in bioinformatics. I continue working to strengthen the skills that might make that possible.

I am older than I was when I first imagined a career in research. I know that returning to the laboratory permanently may not be easy. There are practical questions about opportunity, stability, and finding a place where I can contribute.

But I have not stopped looking.

Perhaps the most unexpected part of this journey is that research helped me become a more engaging teacher, even as it reminded me how much I still want to be a researcher.

I am proud of what teaching has allowed me to give.

But I am not ready to give up on what I still hope to become.

You can find me on LinkedIn.

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