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As COP28, the 2023 United Nations Climate Change Conference, kicks off we look at how maths can help understand the climate crisis.

How do you create dramatic film out of mathematics? We find out with writer and director Timothy Lanzone.

Mathematics plays a central role in understanding how infectious diseases spread. This collection of articles looks at some basic concepts in epidemiology to help you understand this fascinating and important field, and set you up for further study.

Find out why the formula we use to work out conditional probabilities is true!

- We talk about a play that explores the fascinating mathematical collaboration between the mathematicians GH Hardy and Srinivasa Ramanujan.

This and other texts I have read concentrate on the elasticity of the racquet. As a tennis player ( and civil engineer ) my experience strongly suggests that the string tension and modulus of elasticity are just if not more important. Many players use different string type in the longitudinal as opposed to the cross strings while others use different tensions. there seems to be little science involved. My inclination is to attempt to share the impact force of the ball equally between the longitudinal and cross strings by using the one string type and a higher tension in the longitudinal strings.

At this stage the mathematics is beyond me so its trial and error. Best results so far are a tension difference of 5 lbs.

Would appreciate any advice.

Garth Wenck . grwenck@gmail.com