Every word or concept, clear as it may seem to be, has only a limited range of applicability.

Once upon a time, there was a brilliant scientist named Werner Heisenberg. He was a master of quantum mechanics, but he was also a bit of a wild card. He was known for his famous Uncertainty Principle, which basically said that you can never know everything about a particle at the same time. Heisenberg was always unpredictable and his experiments often had unexpected results. He was always pushing the boundaries of science, which often led to humorous situations. For example, one day Heisenberg was carrying out an experiment and he accidentally spilled a beaker of radioactive material. As he was cleaning it up, he said in a very serious voice, "I'm not sure what I'm doing, but I'm pretty sure it's not dangerous!" Heisenberg's experiments were sometimes chaotic, but his discoveries always changed the world of science.