Article
What can we see?
Physics is all about observation. But how much can we actually see with the naked eye?
Article
What can we agree to look for?
The limits to what we can observe are not only a matter of science, but also of politics and economics.
Article
What can science see?
Observing the smallest building blocks of matter doesn't involve seeing in the ordinary sense.
Collection
Who's watching: The limits of observation
Physics is all about observation, but how much can we actually see?
Article
Maths in a minute: Truth tables
Introducing an indispensable tool of mathematical logic.
Article
Something from nothing?
If you can prove that a statement can't possibly be false, does this mean it's true?
Article
Heisenberg's uncertainty principle
There are limits to how much you can simultaneously squeeze the quantum fuzziness of an electron's position and momentum
Article
The real numbers and Cauchy sequences
We take the real numbers for granted, but what are they really?
Article
Citizen science: Schumann resonances
Resonant electromagnetic waves, created by lightning flashes, circle the Earth. Wim Hordijk explores the maths and shows how you can keep track with these phenomena.
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Maths in a minute: Chomp
A game involving biscuits and maths — what could be better?
Article
Maths in a minute: The axioms of probability theory
Take a quick trip to the foundations of probability theory.
Article
Arithmetic billiards
Need to find the least common multiple or greatest common divisor of two numbers? A billiard table of the right proportions holds the answers!