The BrainSnail Blog
Small, practical ideas for learning more with less stress. Study tips, memory tricks and the science of slow and steady.
797 articles · page 2 of 34
What Is Credit? How Borrowing Works and How Lenders Decide
Credit is the trust that lets you use money now and pay later. How interest prices it, what a credit score measures, and why loans cost people different sums.
How Is Steel Made? Iron, Carbon and the Furnace
Steel is iron with a little carbon and a lot of control. How ore becomes iron, how iron becomes steel, and why a fraction of a percent of carbon matters.
How Is a Bronze Statue Made? Destroying the Original to Get the Copy
Lost wax casting builds a wax copy, seals it in a shell and melts it out, then pours bronze into the space the wax left, destroying the original to get it.
How Do Elephants Communicate? Rumbles Below Hearing, Feet That Listen and Names
Elephants talk in rumbles too low for people to hear, felt through the ground kilometres away, and they appear to use names. What the calls carry.
Was Atlantis Real? Plato's Invention and the Search That Never Ends
Atlantis appears in two dialogues by Plato and nowhere before them, a lesson about a proud empire sunk by the gods. Why he made it up.
How Do Bridges Stay Up? Beams, Arches, Suspension and the Forces Between
Every bridge carries its load to the ground by one of a few strategies, and the strategy sets its shape and span. How beams bend, arches push and cables pull.
What Is a Meteor Shower? Comet Dust Hitting the Sky on Schedule
A meteor shower is the Earth passing through the dust a comet left along its orbit, so grains burn up by the dozen each hour. Why they recur, and how to watch.
What Are Parasites? Life at Someone Else's Expense
A parasite lives on or in another organism and feeds on it without killing it outright. The main kinds, how some steer their hosts, and why they are so many.
How Does Archery Work? Bows, Arrows and Why Accuracy Beats Strength
A bow stores the energy of a slow pull and releases it into an arrow in a few thousandths of a second. How bow, string and arrow work together.
What Is Confucianism? Ritual, Respect and the Order of a Good Society
Confucianism is the ethical and political tradition built on the teachings of a Chinese scholar of the sixth century BC. What he taught, and how it ran China.
What Was Megalodon? The Largest Shark That Ever Lived, and Why It Is Gone
Megalodon was a shark up to 20 metres long that hunted whales for fifteen million years and vanished 3.6 million years ago. What teeth tell, and why it is gone.
Why Are There Seven Days in a Week? Babylon, the Planets and a Cycle Nobody Owns
The week has no basis in astronomy, unlike the day, month and year. Where the seven-day cycle came from, why the days are named for planets, and why it stuck.
How Do X-Rays Work? Seeing Bones Through Skin
X-rays are light with enough energy to pass through flesh and be stopped by bone. How they are made, what the dose means, and how a CT scanner builds a slice.
Why Do We Procrastinate? The Psychology of Putting Things Off
Procrastination is not laziness or poor time management; it is a way of escaping a bad feeling about a task. What drives it, and what has been shown to help.
What Is a Category Mistake? Asking a Question That Cannot Have an Answer
Some questions are malformed rather than hard, treating a thing as the kind of thing it is not, which is why asking what colour Thursday is has no answer.
How Did Cotton Shape the Modern World? Slavery, Mills and the Cloth Everyone Wears
Cotton was the first global industry, linking Indian weavers, African slaves, American planters and Lancashire mills. How a fibre made the modern world.
Why Is the Dead Sea So Salty? Evaporation, a Falling Lake and the Lowest Land on Earth
The Dead Sea is ten times saltier than the ocean because rivers bring salt in and only evaporation takes water out. Why it sits so low, and why it is shrinking.
Where Do Surnames Come From? Trades, Fathers, Places and Nicknames
Most European surnames were fixed between the twelfth and sixteenth centuries from four sources, and a name still says which. What the commonest ones mean.
Why Is a Piano Slightly Out of Tune on Purpose? Equal Temperament Explained
No tuning of twelve notes can make every interval pure, so a piano is tuned with every interval slightly wrong by the same amount. Why the maths forces it.
What Is a Plea Bargain? Why Most Criminal Cases Never Reach a Trial
A plea bargain is an agreement in which the accused pleads guilty for a lighter charge or sentence, and it settles nine cases in ten in America. How it works.
How Is Pasta Made? Durum, Dies and Why the Shape Matters
Dried pasta is two ingredients, hard wheat and water, pressed through a die and dried slowly; fresh pasta adds egg. Why durum, and what the shapes are for.
What Is Algebra? Letters for Numbers and the Art of the Unknown
Algebra is arithmetic done with symbols that stand for any number, turning particular sums into general rules. Where it came from, and why the letters matter.
How Does Tattooing Work? Ink Trapped in the Wrong Place Forever
A tattoo lasts because the ink sits in the dermis, which never sheds, held in immune cells that pass it on to their neighbours when they die.
What Is the Coriolis Effect? Why Storms Spin, Winds Curve and Bath Water Does Not Care
The Coriolis effect is the apparent deflection of anything moving across a rotating Earth, curving winds and currents. Why it happens.
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