beach - Chalkdust

The lifeguard wants to reach the swimmer as quickly as possible. The shortest path (dashed) is not the fastest because the lifeguard spends more time in the water, where they are slower.

Sean Jamshidi

Sean is a PhD student researching geophysical fluid dynamics at UCL. He studies coastal outflows, but so far has been unable to persuade the department to send him on a research trip to the beach.

In conversation with Clifford Cocks
We chat to the crypto chief about inventing RSA... but not being able to tell anyone
Unknown pleasures: pulsars and the first data revolution
The scientific story behind the cover of Joy Division's treasured debut
In conversation with Matt Parker
Interviewing Matt was a mistake
Balancing the equation
Reviewing the Royal Institution's first Black History Month event.
Black Mathematician Month 2018
We look back at last year's Black Mathematician Month, and give a preview of what to expect this October.
Fun phenomena in fluids
A selection of weird goings-on from the world of fluid mechanics