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Quantum uncertainty
Quantum mechanics is the physics of the extremely small. With something so far outside our everyday experience it's not surprising to find mathematics at the heart of it all. But at the quantum scale nothing in life is certain... Peter Landshoff explains.
Puzzle page
Are your multiplication problems real or imaginary?
Solution to Puzzle No. 4 - three doors
Yet more taxis!
Solution to "Yet more taxis!"
Solution to "Yet more taxis!"
Mathematical mysteries: Goldbach revisited

Since we first wrote about the Goldbach Conjecture we've had many requests for more information about  it and about how our Goldbach calculator works. We answer some of your questions here but the Goldbach conjecture touches on a strange area of maths that may leave you even more curious than before...
Complex multiplication
Editorial

Testing times
What computers can't do
Mike Yates looks at the life and work of wartime code-breaker Alan Turing. Find out what types of numbers we can't count and why there are limits on what can be achieved with Turing machines.
Three-digit numbers
Light's identity crisis
What is light? Sometimes it seems wave-like and sometimes particle like. See how Einstein applied his theory of relativity to the problem, predicted that photons have no mass and laid the foundations for quantum mechanics.