U.K. covid tracers lose data when accidentally saving as .xls file

This is a great podcast episode for Excel geeks and the page at this link also has other links of interest.

https://timharford.com/2021/05/cauti...ls-cost-lives/

I listen to this podcast regularly and highly recommend it, even though the other episodes have nothing to do with Excel. It is mostly a survey of spectacular errors that could have been prevented.