At school, my favorite subjects were history, biology, chemistry, and physics. Especially the teaching in physics was excellent. Most of my understanding of it I got at high school, not at the university.

Because of the low photosynthetic efficiency and the competition of energy plants with food plants for agricultural land, we should not grow plants for biofuel production. The growth of such energy plants will undoubtedly lead to an increase in food prices, which will predominantly hit poorer people.

As a child, I liked to play outside, to stroll through the fields, and I was an active member of the local children's gang, frequently being chased by field guards and building supervisors. Nevertheless, my performance at school was very good, and mainly due to the influence of my mother, I was allowed to attend high school.

At age eleven, I became a member of the circulating library of my home town. From there on I was rarely seen outside but was reading two to four books per week, the subjects ranging from archaeology over ethnology and geography to zoology. Needless to say that I did not do much homework.