> "Houston, check my math here" he is doing addition, which can't be done on a slide rule.

I still love that scene where it cuts to everyone whipping out their slide rules. It just adds to the mystique of we put men on the moon with such antiquated tech compared to modern standards (even of those available in the 90s when the movie was made).

You've probably seen it, but you'd definitely love the movie "Hidden Figures".

They do seem to get the adding machines more or less correct.