The Swiss psychologist Jean Piaget contends that children below the age of 12 see no necessity for the logical law of non-contradiction. I argue this view is problematic. First of all, Piaget's dialogues with children which are considered supportive of this position are not clearly so. Secondly, Piaget underestimates the necessary nature of following the logical law of non-contradiction in everyday discourse. The mere possibility of saying something significant and informative at all presupposes that the law of non-contradiction is enforced.

We argue that the geometry of spacetime is a convention that can be freely chosen by the scientist; no experiment can ever determine this geometry of spacetime, only the behavior of matter in space and time. General relativity is then rewritten in terms of an arbitrary conventional geometry of spacetime in which particle trajectories are determined by forces in that geometry, and the forces determined by fields produced by sources in that geometry. As an example, we consider radial trajectories in (...) the field of a single particle expressed in the spacetime of special relativity. (shrink)

Martin Luther and doing theology in the future. The Netherdutch Reformed Church of Africa prides itself for the fact that she has always appreciated the German-Lutheran tradition. The Reformed Theological College has for 15 years contributed to the appreciation of this tradition. This article wants to encourage the new leadership to keep this legacy alive. The main aspects of Luther’s theology are explained. These aspects are: prayer, meditation, constitation, grace of the Spirit, exegesis, and the use of other sciences in (...) understanding the Bible. Attention is also given to the subject-matter of Theology as well as the notion of humbleness. (shrink)