A different sort of Darwinism

(Super-)Gravities of a different sort

We review the often forgotten fact that gravitation theories invariant under local de Sitter, anti-de Sitter or Poincaré transformations can be constructed in all odd dimensions. These theories belong to the Chern–Simons family and are particular cases of the so-called Lovelock gravities, constructed as the dimensional continuations of the lower dimensional Euler classes. The supersymmetric ext...

Darwinism and social Darwinism.

Darwinism

Notch Signaling: A Different Sort Makes the Cut

Notch signaling is regulated by ubiquitination of the receptor and its extracellular ligands. New studies reveal distinct ubiquitination-dependent endosomal sorting pathways in which ligand-bound Notch is activated while unliganded Notch is recycled or degraded, facilitating signaling while preventing inappropriate activation of unstimulated receptors.

A Revised Darwinism

Stephen Jay Gould's last book and magnum opus is first and mainly a theoretical revision. The revision is of Darwinism, in both its original and Modern Synthesis formulations, of what Gould calls the " tripod of support " on which the theory of natural selection traditionally rests. This tripod consists of three major claims: (1) The sufficiency of natural selection acting at the level of the i...