Incompressible Memes

When textbooks say "assume inviscid and incompressible flow," aerospace engineers transform into cartoon villains plotting revenge. Those simplifications are the biggest lies in fluid dynamics – like pretending air has no friction and doesn't squish when you fly through it at Mach 2. Meanwhile, real-world engineers are cackling because they know these "minor details" are why your perfect theoretical calculations burst into flames during actual flight tests. Nothing says "welcome to aerospace" like discovering your beautiful equations only work in a fantasy universe where physics took a vacation.