Haha, so true. Structures can have multiples of strength for safety margins. Airplanes have 50%. Spacecraft - 10%. There's no way anyone is going to design spacecraft parts without being very good at math.
“furniture designers, incredibly, are not taught during their formal training how to calculate the deflection in an ordinary bookshelf when it is loaded with books,”
― J.E. Gordon, Structures: Or Why Things Don't Fall Down