More than 20 science talks covering various science disciplines will be offered in 2026-27. Our teachers will deliver science and admissions talks at local secondary and international schools. The talks cover a variety of science topics, ranging from recent scientific discoveries to thematic science issues related to our daily lives. They are suitable for F.4, F.5, and F.6 students and international school students of equivalent level.
Categories of science talks |
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Developments in Drugs and Medical Science |
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ST0206New
You Are What You Eat: How Nutrition Can Influence Your Genes?By School of Biological Sciences
Level: F.5 – F.6
HKDSE Related Subject(s): Biology, ChemistryWhat we eat can affect how our bodies work. Nutritional genomics looks at how food and genes interact. Some nutrients can change how genes work, while genes can also affect how people respond to different foods. Epigenetics is about changes in gene activity that do not change the DNA itself. These changes can be passed on when cells divide. Research suggests that the food choices of parents may even affect the health of their children and grandchildren. So, we are not only shaped by what we eat, but also by what our parents and grandparents ate. |
ST0208New
Dish Soap or Delicacy? What Your DNA Says About CorianderBy School of Biomedical Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): BiologyDo you love coriander, or do you think it tastes like dish soap? The answer is not just in your mouth - it is written in your DNA! In this talk, we will explore the world of genetics and bioinformatics to understand how Single Nucleotide Polymorphisms (SNPs) can shape our unique human traits. We will step into the shoes of a genetics detective, learning how to read mRNA sequences and use real-world computational databases to hunt down the gene(s) responsible for our food preferences. Beyond coriander, we will discuss how these same research tools are revolutionising modern medicine. |
ST0004
Understanding CancerBy School of Biomedical Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): BiologyCancer is a genetic disease caused by alterations in oncogenes and other related genes. In this talk, the speaker will first introduce the ground-breaking discovery of oncogenes, which was awarded the Nobel Prize in 1989. How a normal gene can become an oncogene through mutations, and the underlying mechanisms, will be explained. Examples will be provided to illustrate how our understanding of oncogene function has led to a revolution in the design and development of highly specific and effective anti-cancer drugs that target oncogenes. This new form of individualized treatment is known as precision medicine. |
ST0183
Understanding COVID-19 and SARS-CoV-2By School of Biomedical Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): BiologyThe pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is still ongoing. In this talk, the speaker will give a brief introduction to the science of COVID-19 and SARS-CoV-2. The talk will cover all important areas, including the origin of SARS-CoV-2, the life cycle of the virus, COVID-19 disease, diagnosis, treatment, and vaccine development. In particular, the talk will highlight how HKU scientists have made a difference in the fight against COVID-19. It will also address many key questions, such as whether SARS-CoV-2 is man-made, how vaccines are developed, and how safe and effective existing vaccines are. |
ST0184
Stem Cell Therapies – Reality vs. HypeBy School of Biomedical Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): BiologyWhat are stem cells? Why the doctors and scientists are so excited about stem cells? Recently, biomedical scientists reported the creation of the first human synthetic model embryos. Such breakthroughs could help research genetic disorders but raise serious ethical and legal concerns. In the first part of this talk, the speaker will discuss the unique features of stem cells, the different types of stem cells and some of their potential applications (i.e., hopes). The second part of the talk will focus on ethical issues in stem cell research and therapy. |
ST0198
Learn from Nature, Drug Discovery from Tiny MicrobeBy Department of Chemistry
Level: F.4 – F.6
HKDSE Related Subject(s): Biology, ChemistryThe alarming increase in antibiotic-resistant bacteria, known as "superbugs," is a significant global health issue. In this talk, the speaker will provide a concise overview of antibiotic resistance and the cutting-edge strategies used to develop new antibiotics to fight these dangerous pathogens. Essential topics covered include the origins of antibiotic resistance, the discovery of antibiotics, and the innovative methods employed by HKU scientists to combat antibiotic resistance. The talk will discuss how we can draw inspiration from nature in discovering new antibiotics by learning from the diverse chemicals produced by microbes. Additionally, it will emphasise using state-of-the-art techniques such as AI, big data, synthetic chemistry, and synthetic biology in the quest for new antibiotics. This talk aims to motivate and inform secondary school students about the vital role of scientific progress in tackling global health challenges. |
ST0201
Exploring our Gene: Drug Development to Combat CancersBy Department of Chemistry
Level: F.4 – F.6
HKDSE Related Subject(s): Biology, ChemistryCancers has long been the major cause of mortality in Hong Kong. Genomic and biochemical studies have increasingly played an important role in prognosis, diagnosis, and drug development against a variety of cancers. In this talk, an overview of the nature and risk factors for cancers will be reviewed. Methods to identify the potential biomarkers and targets by DNA sequencing and biomolecular investigations will be shared. Some steps of drug development including structureactivity relationships (SAR), pharmacophore identifications, lead optimisations and pharmacokinetic studies will be covered. Examples of how drug molecules act against different targets in cancers will be shown for students to appreciate the mechanism of action of potential drug candidates based on scientific research. |
Developments in Science and Technology |
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ST0209New
Beyond Covalent Bond: Building Nano-Robots and Molecular KnotsBy Department of Chemistry
Level: F.5 – F.6
HKDSE Related Subject(s): ChemistryMost of what you learn in school chemistry is about atoms glued together by covalent bonds. But what happens when molecules interact without sticking together permanently? Welcome to the world of supramolecular chemistry and mechanical bonds, where molecules are looped together like tiny chain links or threaded like beads on a string! In this talk, we will step beyond standard chemical bonds to explore how scientists are weaving molecules into nanometer-sized machines, self-healing materials, and smart switches. Come discover how these 'impossible' structures are changing everything from medicine to technology, and why the future of chemistry is way cooler than your textbook lets on. |
ST0160
How May Artificial Intelligence Change Our Society? By Faculty of Science
Level: F.4 – F.5
HKDSE Related Subject(s): Biology, Chemistry, Geography, Mathematics and PhysicArtificial Intelligence is no longer a postulate about the future, but is already bringing noticeable impacts to our current society. Will the AI revolution lead to a reform in our economy? Is it simply another Industrial Revolution? We will address these questions in the talk. |
ST0176
Molecular Gastronomy: The Science of CookingBy Department of Chemistry
Level: F.4 – F.6
HKDSE Related Subject(s): Biology and ChemistryChemistry lies at the heart of the very finest food available, and the science of cooking has recently moved from the playground of a few chiefs into the realm of serious scientific endeavour. Applying chemistry and other sciences to restaurant and domestic cooking revolutionised the dining experience and led to new enjoyment and appreciation of food. In this talk, we will cover some applications of chemical and physical techniques in restaurant kitchens to produce novel textures and flavour combinations. |
ST0177
Bending the Laws of Nature: From Microscopy to Nanoscopy By Department of Chemistry
Level: F.4 – F.6
HKDSE Related Subject(s): Biology, Chemistry and PhysicsThe optical microscope has enabled us to peer into the microscopic world and shed light on biological processes at the cellular level in a non-destructive manner. Over the years, breakthroughs in chemical and biological techniques have further allowed cellular and sub-cellular components to be identified with high degrees of specificity. However, a fundamental set of physical laws limits the spatial resolution in optical microscopy. This restricts the ability of optical instruments to distinguish distances at the nanoscale and thus limits their utility in resolving fine details of important sub-cellular structures. In this talk, we will journey through technological advances and illustrate how interdisciplinary innovations have bypassed the physical barrier and eventually led to the Nobel-winning technology of super-resolution nanoscopy. |
ST0200
Teen Power: How Food Shapes Your Mood, Mind & MusclesBy School of Biological Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): Biology and ChemistryThis talk explores how essential nutrients such as vitamins, minerals, carbohydrates, proteins, and fats play critical roles in brain function, emotional regulation, and physical growth. Scientific research demonstrating how certain foods and nutrients can enhance mood stability, improve cognitive abilities such as memory and concentration, and support muscle development will also be explained. |
Ecology, Environment and Planet Earth |
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ST0207New
From Food Waste to Food Security: Can Science Help Feed Hong Kong Sustainably? By School of Biological Sciences
Level: F.5 – F.6
HKDSE Related Subject(s): Biology, Chemsitry and GeographyHong Kong relies heavily on imported food, while large amounts of edible food are discarded every day. This talk explores how science can connect food waste reduction with a more secure and sustainable food system. Students will examine why food is wasted, how spoilage occurs, and how technologies such as preservation, fermentation, composting, anaerobic digestion, vertical farming, and food upcycling can recover nutrients, energy, and value. Through local examples, the talk will also consider food safety, environmental impact, cost, and consumer acceptance. Students will be encouraged to evaluate which solutions are most practical for improving Hong Kong’s future food resilience. |
ST0195
Groundwater: An Invisible Treasure On Earth By Department of Earth & Planetary Sciences
Level: F.5 – F.6
HKDSE Related Subject(s): Geography and PhysicsWhen standing in front of running rivers or calm lakes, we might recall words of Lao Tzu: ‘The highest good is like water, nourishing all things and not contending with them (老子雲：上善若水，水利萬物而不爭)’. However, what we see is only a thin veneer of freshwater on earth. The majority (~99%) of liquid freshwater is from invisible underground, termed groundwater. It provides potable water for humans, irrigates crops, sustains various ecosystems, etc. The talk will give a picture on the principles and societal impacts of groundwater on earth and how it serves as a hub among different Earth spheres and human society. |
ST0202
Mechanisms of Large-to-Super Volcanic EruptionsBy Department of Earth & Planetary Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): Chemistry, Geography and PhysicsMore than 800 million people live near active volcanoes and are exposed to the risk of volcanic eruptions. While smaller eruptions occur more frequently, large-magnitude eruptions are rare but far more hazardous. Large or super eruptions can be catastrophic on a global scale, emitting tremendous amounts of volcanic ash and aerosols that affect Earth’s atmospheric circulation and contribute to climate change. What causes these eruptions? How can we find the answers if we cannot dive into volcanic conduits or the Earth’s interior ourselves? This talk will share the perspectives of volcanologists who strive to reveal eruption triggers and provide forecasts using a combination of mineralogical, geochemical, and geophysical approaches. |
ST01203
What Do We Know About Tropical Cyclones and Their FutureBy Department of Earth & Planetary Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): GeographyTropical cyclones are among the most familiar weather systems to citizens in Hong Kong. As the climate continues to warm, how future tropical cyclones will change remains largely unknown. This talk will briefly introduce fundamental knowledge about tropical cyclones, including their genesis, movement, structure, intensity, and associated hazards. More importantly, it will discuss the current understanding—from climatologists’ perspectives—of how and why tropical cyclones may change under projected climate warming. The possible drawbacks of these climate projections will also be discussed, highlighting how limited our knowledge still is in this exciting area. |
ST0205
How and Why Do Animals Talk? By Faculty of Science
Level: F.4 – F.6
HKDSE Related Subject(s): BiologyAnimals make a variety of noises, from mating calls to complex communication. But why do they produce these sounds, and what drives the evolution of their vocalizations? |
Mathematics |
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ST0153
What the Man Who Knew Infinity KnewBy Department of Mathematics
Level: F.4 – F.6
HKDSE Related Subject(s): MathematicsYou may have seen the recent movie “The Man Who Knew Infinity” about the Indian mathematician Ramanujan (and his interactions with GH Hardy and Littlewood, among others). In this talk, we will introduce some of what Ramanujan studied and discuss his impact on the mathematical world since that time. |
ST0181
Counting to InfinityBy Department of Mathematics
Level: F.4 – F.6
HKDSE Related Subject(s): MathematicsLearning to count is an important developmental milestone in early childhood. But what exactly are we doing when we count? Can the process be generalised in a way that can allow us to compare sets of infinite size? Do all infinite sets essentially have the same size? In this talk, we will try to explore the mysteries of infinite sets and briefly discuss different sizes of infinities. |
ST0182
Prime Numbers: A Simple and Difficult Topic in Number Theory By Department of Mathematics
Level: F.4
HKDSE Related Subject(s): MathematicsAn integer larger than 1 that does not have any divisors other than 1 and itself is called a prime number. It is a simple concept that we have learned since primary school. However, it is at the same time a difficult topic in number theory. There are many unsolved problems related to prime numbers. We will discuss some of these interesting problems in the talk. |
ST0197
The Mathematical Key to Unlocking the Mysteries of CryptographyBy Department of Mathematics
Level: F.4 – F.6
HKDSE Related Subject(s): MathematicsCryptography is the art of passing secret messages. In this talk, we will discuss the history of secret message passing and the role that mathematics has played in its development. We will also learn about Caesar ciphers, the Enigma machine, the RSA algorithm and prime factorisation, and the discrete logarithm problem for elliptic curves. We will discuss this all within the context of a research-level cryptography problem known as homomorphic encryption that has possible applications to safe shared cloud computing with private or sensitive data. |
Mysteries in Space |
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ST0015
Are We Alone: The Search for Planets around Other Starsby Department of Earth Sciences
Level: F.4 – F.6
HKDSE Related Subject(s): Biology and Physics Are we alone in the Universe? Scientists have made the first step in answering this question by finding planets outside our Solar System. How do they find these planets? Are these planets different from those in our Solar System? What are the prospects for finding planets suitable for life, and what are the signs of life? |
Understanding the Physics of Nature |
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ST0210New
A Story of Light: From A Prism To A Smartphoneby Faculty of Science
Level: F.4 – F.6
HKDSE Related Subject(s): Physics Once upon a time, after Newton studied the properties of light via a prism, light was an object that confused physicists for a long time; they asked, “Does light behave as a particle (like a football) or a wave (like a water wave)?” In this talk, we will explore how physicists have found the answer over the years by conducting experiments and examining theoretical formulations. We will also explore the endeavour of answering the question: new knowledge emerged, which led to modern electronics and therefore the era of smartphones. |
Application opens: 31 August, 2026
Online application
