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Little bobby Fortran
(jlai.lu)
Post funny things about programming here! (Or just rant about your favourite programming language.)
And it is still living in weather forecasting models used by many weather institutes.
Source: Work for a weather institute.
We use those too! The weather forecasting models are really important for calculating prices in the German Energy market. My company is even paying people extra for learning Fortran to do these tasks. It's really weird to talk to 20-something y/o people who actively use Fortran.
And a lot of science libraries.
Source: married to a physicist.