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@HGourlayUCL I think one of the most important things we should resurrect and develop is the idea of solving problems by estimation; the Fermi approach. It is a skill for life that needs to sit alongside making up solutions and concentrations.
It's not very sexy but you can take articles out of the newspaper every day and try to make sense of chemistry, physics and more just by running some arithmetic and powers of ten.
Accuracy and precision can then follow further down the road.