With Picaboo.
by Jozeppe:
There was a school with a biological inclination going out to nature to study ants. Thro the day, students examined ants and carried out measurements. The next day, they brought their class to the teacher. In the course there was such a conclusion: the perimeter of the foundation of the ant (read the length of the circle) in all the measured ants was always three times larger than the diameter of the foundation of the ant. And it did not depend on the size of the ants and the breed of the ants themselves. They went to Nobel!