whether fasting and changes in diet might be changing leptin levels, thus altering the function of T cells. The implication of this new work is that leptin drives the activity of pro-inflammatory, self-reactive T cells, and that starvation, which reduces leptin production, changes the pattern of cytokines generated and the disease-inducing potential of the T cells. So, the authors show that ins...

Most of the alarming data about temperature rises as a result of likely climate change have come from high latitudes and altitudes. There appears growing evidence that glaciers and ice sheets are melting rapidly. The latest evidence comes from comparisons of pictures in the Andes reported last month which show that the Upsala glacier in Argentina has melted substantially, creating a lake where ...

It is proved that a triangulation of a polyhedron can always be transformed into any other triangulation of the polyhedron using only elementary moves. One consequence is that an additive function (valuation) defined only on simplices may always be extended to an additive function on all polyhedra. 2000 AMS subject classification: 52B45; 52A38; 57Q15;