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 1 of 34
What Is a Statute of Limitations? Why Old Claims and Crimes Expire
A statute of limitations is a law that bars a lawsuit or prosecution after a set time has passed. Why the clock exists, and when it starts.
What Is a Pulsar? A Lighthouse Made of a Dead Star
A pulsar is a spinning neutron star that sweeps a beam of radio waves across the Earth with each turn, ticking like a clock. What makes it pulse.
What Happened on Easter Island? The Statues, the Trees and the Argument
Easter Island's people raised nearly a thousand giant statues and then, the story goes, cut down every tree and starved. What the evidence shows instead.
How Is a Tapestry Made? Pictures Built Thread by Thread
In a tapestry the picture is the cloth, woven from coloured threads that travel only as far as their own patch of colour.
How Does Fencing Work? Right of Way, Three Weapons and Electric Scoring
Fencing is a duel with blunted swords, scored by electric contact and, in two of its three weapons, by who had the right to attack. The weapons and the rules.
How Do Sharks Sense Their Prey? Smell, Electricity and a Line Along the Body
Sharks find prey with senses humans lack, including detectors of the electric fields all animals give off. How each sense works, and what the myths got wrong.
How Do Postcodes Work? Turning an Address Into a Sorting Instruction
A postcode encodes a sorting instruction rather than a place, which is why its boundaries follow delivery convenience and cross county lines.
How Do Canal Locks Work? Lifting a Boat With Nothing but Water
A lock raises or lowers a boat between two water levels by filling or emptying a chamber. How the gates and paddles work, and how Panama lifts a ship 26 metres.
How Do Bones Heal? Living Tissue Rebuilding Its Own Scaffolding
A break is one of the few injuries the body rebuilds rather than merely scarring over, because bone is living tissue that rebuilds itself continuously anyway.
How Did Shakespeare Change English? Words, Phrases and a Language in Motion
He is credited with inventing two thousand words, which is far too many. What he really coined, the phrases he fixed, and why they stuck.
Did Dinosaurs Live in the Arctic? Fossils From Months of Darkness
Fossils sit well inside both polar circles, where winter ran dark for months. How they coped, and what newly hatched bones in Alaska settled.
What Is a Counterexample? One Case That Ends an Argument
A universal claim says something holds in every case, so one case where it fails destroys it completely, and the asymmetry is a powerful tool in reasoning.
How Are Dictionaries Made? Recording a Language That Will Not Hold Still
A dictionary is a report on how words are used, not a licence to use them. Where the evidence comes from, and the row that descriptive work caused.
How Are National Borders Drawn? Rivers, Rulers and Old Treaties
A third of Africa's boundaries are straight lines, and almost none of Europe's are. The kinds of line, why rivers fail, and where disputes still run.
How Did Recording Change Music? Three Minutes, Takes and Endless Repetition
Music went from an event that vanished to an object that sounds the same forever. How format limits shaped songs, and what tape and software changed.
What Was Velociraptor Really Like? Turkey-Sized, Feathered and Nothing Like the Film
The Velociraptor of the films is a two-metre scaly pack hunter; the real one was the size of a turkey and covered in feathers. What the fossils say.
What Is Lent? Forty Days, Fasting and the Road to Easter
Lent is the forty-day season before Easter in which Christians fast and prepare, modelled on Jesus's forty days in the desert. What is left of it.
What Was the Giant Ground Sloth? Megatherium and the Animal That Pulled Down Trees
Megatherium was an elephant-sized sloth that reared up to browse the trees of South America until 10,000 years ago. How it lived, and why it vanished.
What Is Cognitive Load? Why the Mind Can Hold Only So Much at Once
Cognitive load is the demand a task places on working memory, which holds only a few items at a time. The three kinds of load, and how to design around it.
What Is a Search Warrant? When the State May Enter Your Home
A search warrant is a court's written permission for the police to enter and search a place, given only when a judge is satisfied. The tests, and the exceptions.
What Is Geometry? From Measuring Fields to the Shape of Space
Geometry began as the measuring of land and became the study of shape and space. Euclid's system, the geometries that broke his fifth rule, and where it went.
How Does a Bicycle Stay Upright? Gyroscopes, Trail and a Century of Wrong Answers
A moving bicycle balances itself, and for a century physicists gave the wrong reason. What the gyroscope does and does not do, what trail is, and the 2011 test.
How Did Medieval Castles Work? Walls, Sieges and the End of the Fortress
A castle was a fortified home for a lord and a base for holding land, built to make attack expensive. How the defences evolved, and why cannon ended them.
How the Potato Changed the World: From Andean Tuber to Half of Europe's Dinner
The potato was domesticated in the Andes, feared in Europe for two centuries, then fed the industrial age. Why it was distrusted, and the famine it caused.
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