The Rosenbrock function, often used to test Evolutionary Algorithms, was thought to be unimodal in higher dimensions. However, it was discovered that the n-dimensional Rosenbrock function actually has 2 minima for dimensions ranging from 4 to 30. This means it's not as simple as previously believed. Additionally, one of the supposed "local minima" for the 20-variable Rosenbrock function may not actually be a local minimum.