More and more often I am reminded of an old school experience. In elementary school I was the sixth or seventh grade, when a primary school schoolmistress on an arithmetic clock substituted, and in the course of one of the tasks 0.6 divided by 0.2 was equal to 0.3. I was surprised, and I started feeling uncomfortably. In the end I raised my hand, and I corrected that 0.6 divided by 0.2 is equal to 3. By this hell broke loose.