They stress the collected body of knowledge and the problems solved, whereas the unknown is often not even mentioned. As soon as one starts to study more closely a special area of natural science it becomes, however, very obvious that many things are unknown, not studied or not understood. In the area of chronobiology this is especially obvious. It is a relative young branch of biology and therefore not much knowledge has been accumulated. In this part we will get to know some general methods of scientific work.
Scientific work consists to a substantial part of answering questions.
Questions arise, for instance, by observing. If we walk in the evening through a meadow, the threeparted leaves of clover are differently positioned as compared to the day time. Fragrancy intensity of flowers of Exacum affine as a function of day time, estimated by three different persons. Strongest odour in the early afternoon. Mean values with standard error.