We like things to be observable. Thus, a few things we don't easily grasp are: - exponential growth, which is non intuitive when you are used to thinking in a

We like things to be observable. Thus, a few things we don't easily grasp are: - exponential growth, which is non intuitive when you are used to thinking in a linear fashion - long-term effects, due to our propensity to focus on the near term - grasping points of view we are strongly opposed to. This can be overcome with practice though