Walgreens said on Wednesday an error in its’ system stopped people 65-years-old or older temporarily from making a COVID-19 vaccine appointment at their Iowa stores.

At the same time, dealing with an old, sluggish computer is a frustrating experience. If apps and websites are taking ages to load, it can seriously impact your productivity.

The mistake was swiftly fixed, but mathematicians say that the episode highlights the importance of making maths computer-readable to catch other possible examples.