Science
41 explanations and counting.
How does nuclear fission work?
Nuclear fission is like cracking open the world's tiniest nuts to release enormous amounts of energy — enough to power entire cities.
What is a reflex?
Your body has a secret ninja defence system that reacts faster than your brain can even think — and it's been keeping you safe your whole life.
How do your kidneys work?
Your kidneys are like tireless janitors, cleaning your blood 24/7 and deciding what your body keeps and what gets flushed away.
What is the periodic table?
It's like the ultimate cheat sheet for everything in the universe — every atom that exists has its own special spot on this brilliant chart.
What is a stem cell?
Stem cells are like your body's ultimate spare parts — they can transform into any type of cell your body needs, from brain cells to skin cells.
What causes cancer?
Cancer happens when your body's cells start breaking the rules and growing out of control — but understanding why can help us fight back.
What is the nervous system?
Your nervous system is like your body's electrical network, sending lightning-fast messages between your brain and every part of you.
How do antibiotics work?
These tiny medicine warriors hunt down bacteria in your body like microscopic bouncers, but they're completely useless against viruses.
What is a gene?
Genes are like instruction manuals written in a secret code that tell your body how to build everything from your eye colour to your height.
How does anaesthesia work?
Anaesthesia turns off your brain's pain signals like flipping a switch, but the science behind this medical magic is surprisingly mysterious.
What is radiation?
Radiation sounds terrifying, but sunlight is a form of it — the word just means energy travelling through space.
What's the difference between a virus and a bacterium?
Both can make you ill, but viruses and bacteria are completely different things — and that's why different medicines treat them.
How do painkillers work?
Pop a paracetamol and the pain fades — but how does a tiny tablet know exactly where it hurts?
What is blood made of?
Blood isn't just a red liquid — it's a complex mix of cells, proteins, and tiny messengers all doing different jobs.
Why do we hiccup?
Hiccups are a weird glitch in your body — but there's actually a reason your diaphragm throws a tantrum.
What is the placebo effect?
Sometimes a sugar pill that does nothing can make people genuinely feel better. That's not self-delusion — it's one of the most powerful and least understood phenomena in medicine.
How do GLP-1 drugs (like Ozempic) work?
Ozempic and drugs like it have changed how millions of people think about weight. But how does a weekly injection tell your brain you're not hungry?
What is a hormone?
Your body doesn't use wires to send messages — it uses chemicals released into the blood. Hormones are those chemical messages, and they control almost everything about how you feel and function.
How does nuclear fusion work?
It's the same process that powers the Sun — smashing atoms together to release enormous energy. Scientists have been trying to do it on Earth for 70 years, and they're finally getting close.
What is CRISPR?
Scientists can now edit the genetic code inside living cells like editing a document — cutting out errors and replacing them with working instructions. CRISPR is the tool that made it possible.
What is the gut microbiome?
Your gut is home to trillions of bacteria, viruses, and fungi that affect your digestion, immune system, and even your mood. Far from being harmful, most of them are essential.
What causes allergies?
Your immune system treats peanuts like a mortal threat. Pollen makes you sneeze for weeks. Why does the same system that defends you sometimes attack harmless things?
What is the immune system?
Your body is under constant attack from bacteria, viruses, and other threats. The immune system is the remarkable defence network that fights them off — usually without you noticing.
Why do we need sleep?
You spend about a third of your life unconscious. Sleep isn't wasted time — it's when some of the most important work your body does actually happens.
Why do we have seasons?
It's nothing to do with how far Earth is from the Sun. It's all about tilt — and the answer is stranger than you'd think.
What is gravity?
It keeps you on the ground, holds the Moon in orbit, and shapes the entire universe. But what actually <em>is</em> it?
What is evolution?
Every living thing on Earth — from oak trees to blue whales to you — is related. Here's the process that produced all that extraordinary variety.
How does the human eye work?
Your eye captures millions of data points every second and sends them to your brain as electrical signals. Here's the remarkable mechanics behind it.
How does sound travel?
Sound isn't a thing — it's a movement. Understanding how vibrations travel through air (and other materials) explains everything from music to thunder.
What are atoms made of?
You and everything around you is made of atoms — and atoms themselves are made of even smaller things. Here's how deep the rabbit hole goes.
How do magnets work?
Magnets can attract metal through a wall without touching it. The explanation involves spinning electrons — and it's genuinely weird.
What causes the Northern Lights?
Curtains of green, purple, and pink light dancing across the night sky. It's one of the most spectacular things nature produces — and it's caused by the Sun bombarding Earth.
How does the brain work?
The most complex object known to exist in the universe weighs about 1.4kg and sits in your skull. Here's a beginner's guide to the thing doing the reading right now.
What is a chemical reaction?
Chemistry isn't just something that happens in labs. It's happening inside your body right now, in your food, in the air. Here's what a chemical reaction actually is.
Why do we age?
Ageing isn't just wear and tear — it's written into your biology at a cellular level. Scientists now understand quite a lot about why it happens.
How does electricity work?
You use it every single day. But what actually is electricity, and how does it get from a power station to your phone charger?
What causes thunder and lightning?
A thunderstorm is basically a massive static electricity machine in the sky. Here's exactly what's happening up there.
What is DNA?
Inside almost every cell in your body is a set of instructions so long it would fill 3,000 books. That's DNA — and it basically built you.
Why do we dream?
Every night your brain puts on a private cinema just for you. Scientists still aren't totally sure why — but they have some pretty fascinating ideas.
Why is the sky blue?
The sun's light is actually all the colours at once. So why does only the blue bit reach your eyes? Here's the weird truth.
How do vaccines work?
Vaccines train your immune system to fight diseases before you ever get ill. It's like a fire drill for your body.