On Jean-Jacques Rousseau’s Ideal of Natural Education

The aim of this contribution is to critically explore the understanding, the goals and the meaning of education in the philosophy of education by Jean-Jacques Rousseau. In his educational novel Emile: or On Education [Emile ou De l’éducation] he depicts his account of the natural education. Rousseau argues that all humans share one and the same development process which is independent of their social background. He regards education as an active process of perfection which is curiosity-driven and intrinsic to each child. Rousseau’s educational goals are autarky, happiness and freedom

Lateral Expansion of the Bridges of Cygnus A and other Powerful Radio Sources

Measurements of the width of the radio bridge at several locations along the bridge for each of four powerful extended radio sources are presented. Adopting a few simple assumptions, these measurements may be used to predict the radio surface brightness as a function of position across the radio bridge. The predicted and observed surface brightnesses across the bridges are compared and found to agree fairly well. The results are consistent with a simple picture in which the radio power and size of the radio lobe at the forward edge of the radio bridge are roughly time-independent for a given source, and the expansion of the bridge in the lateral direction is adiabatic. There is no indication that reacceleration or energy transport is important in the bridges of these sources. The rate of lateral expansion of the bridge just behind the radio lobe and hotspot in terms of the rate of forward propagation is compared with that predicted, and found to be in good agreement with the predicted value.Comment: 7 pages, uuencoded compressed postscript. To appear in the Proceding of the Cygnus A workshop, May 1-4, Green Bank, W

Comment on ``Absence of abelian Higgs hair for extremal black holes''

We examine the claim of Chamblin et. al. that extreme black holes cannot support abelian Higgs hair. We provide evidence that contradicts this claim and discuss reasons for this discrepancy.Comment: 1 page 2 figures, revised titl