How long does it take for one person to infect another?
How does a smooth flow suddenly become turbulent? The Reynolds number helps understand the transition.
In this year's advent calendar we celebrate our collaboration with the Isaac Newton Institute for Mathematical Sciences.
How does water, or indeed any fluid, move? The Euler equations let us look beneath the surface and mark the beginning of modern fluid dynamics.
If you ignore exponentially small terms they can come back to bite you.
How a question about rainbows led to an entire field of mathematics.