Pick a subject, choose your level, and dive in. Each quiz is written and fact-checked by hand, with an explanation after every answer.
111 quizzes · page 5 of 5
Square flags, two-sided flags, a flag with a rifle on it and one that is flown upside down in wartime.
The off-centre cross used by Denmark, Sweden, Norway, Finland and Iceland is known as what?
Dragons, lions, temples and one island drawn in copper — ten things countries put in the middle of their flags.
Which country's flag features a temple complex?
Coats of arms, national animals, plants and personifications — the symbols countries use when a flag will not do.
Which flower is the emblem of the Japanese imperial family?
Ten questions on how things move, why they stop, and what a force actually does to them.
Newton's third law says forces come in pairs. What is true of the two forces in a pair?
Where energy goes, why heat only ever flows one way, and why a metal handle feels colder than a wooden one.
What does the temperature of a substance actually measure?
Why thunder lags behind lightning, how a straw appears to bend in a glass, and what makes a passing siren drop in pitch.
Why can sound not travel through the vacuum of space?
Circuits, compasses and induction: ten questions on the two forces that turned out to be one.
Ohm's law relates three quantities. Which statement expresses it?
Ten elements with a distinguishing feature — a strange symbol, a record melting point, a name borrowed from Greek.
Which element does the symbol K stand for?
Electrons changing hands, molecules changing shape, and the rules that decide how fast any of it happens.
In an ionic bond, what happens to the electrons involved?
Why bread goes stale, why onions sting and why ice floats — ten kitchen-cupboard questions with real answers.
Baking soda makes a cake rise by releasing which gas?
Ten moments that turned alchemy into a science, from the death of phlogiston to the first fully synthetic plastic.
Which chemist named oxygen and showed that the phlogiston theory of burning was wrong?
Ten questions on the machinery packed inside a single cell, from ribosomes to the membrane that holds it together.
Which cell structure assembles proteins from amino acids?
Base pairs, codons, alleles and the arithmetic of what gets passed on — ten harder questions on genetics.
In DNA, which base always pairs with adenine?
How the mechanism actually works, what it acts on, and the evidence that convinced biologists it does.
On which ship did Charles Darwin make the voyage that shaped his thinking?
Who eats whom, what happens to the energy along the way, and why removing one species can change everything.
What is an organism that breaks down dead material called?