Human activities are creating major environmental changes on the planet, contributing to habitat loss, climate change, pollution, and consumption of natural resources. Such changes place enormous pressures on biodiversity, disrupting long-standing evolutionary processes. David Jablonski, a paleontologist at the University of Chicago and a recently elected member of the National Academy of Scien...

I give a brief review of Big Bang Nucleosynthesis (BBN) and of the Cosmic Microwave Background Radiation (CMBR). The methods used to constrain YP by the CMBR are then discussed, including methods later discarded in favor of others. To conclude, I give limits found by our analysis and discuss the implications of said limits.

and admired but few are loved. Th e avalanche of tributes and accolades that have fl ooded in since the tragic and premature death of David Bennett demonstrates the intense warmth and aff ection in which he was held. David qualifi ed from the Middlesex Hospital, London, in 1963. He spent a year as a Fulbright scholar in the pulmonary physiology lab at Johns Hopkins in Baltimore but otherwise wo...

The article reviews the research of David Gale, who made lasting contributions to game theory, general-equilibrium theory, and growth theory. In addition to his influence on the development of economic theory, his work has had important implications for many branches of mathematics and on mathematical education.

D avid Tilman describes himself as both a theoretical and an experimental ecologist. Currently the McKnight Presidential Chair in Ecology and Regents Professor at the University of Minnesota (St. Paul), Tilman has spent his career developing theories of biodiversity and species composition that he has tested in carefully designed and controlled experiments. His work on resource competition in b...

axiomatics. A main feature of Hilbert’s axiomatization of geometry is that the axiomatic method is presented and practiced in the spirit of the abstract conception of axiomatics that arose at the end of the nineteenth century and which has been generally adopted in modern mathematics. It consists in abstracting from the intuitive meaning of the terms for the kinds of primitive objects (individu...

My talk will focus on the brain mechanisms of addiction with a particular emphasis on the use of brain imaging [both PET and MRI]. I will discuss the latest research in relation to the neurotransmitter mechanisms of addiction and show how we can develop imaging techniques to explore the modes of actions of existing and novel treatments for addiction

An anatomical exposition of the structure of the human body, trans. Lords of the Admiralty for the effectual cure of such seamen belonging to the Navy as may have ruptures, London, 1734. The paper, read on the occasion of the centenary of David Livingstone's death in what is now the independent African country of Zambia, was divided into three sections. The first part was devoted to Livingstone...

Hydraulic microelectrode advancermade by David Hubel David Hubel was a giant in our field, yet he waswarm, friendly, and humble in person. He and Torsten Wiesel, following in the footsteps of their mentor Steve Kuffler, discovered fundamental principles of information processing in the brain and fundamental principles of how the brain wires itself up. I think many people in the field see David ...