By changing the material commonly used to make devices for generating entangled photons, researchers create a quantum light source that is significantly brighter than others.

CONTEXT The GyneFix intra-uterine device has been used in our family planning service since 1997. One of the perceived advantages is its low expulsion rate, as reported by clinical trials. OBJECTIVE To calculate expulsion rates in routine clinical use and to look at possible reasons for expulsion. DESIGN Retrospective casenote analysis and opportunistic client consultation. SETTING A city...

Little is known about the state of experimentation in the field of medicine during the Medieval Islamic era. With few exceptions, most of the contemporary sources on history of medicine propagate the idea that the roots of experimental medicine in its modern form, including clinical trials and drug-potency studies, first started during the European Renaissance in the 16(th) to the 18(th) centur...

The most distinctive feature of this clearly written and engaging book is that throughout its ten chapters, the author simultaneously develops two independent projects. The first project, as the title suggests, is to introduce the novice to some of the traditional issues in the philosophy of mind. To this end, the book is structured around discussions of dualism, physicalism, the problem of oth...

This paper reports a simple two-alternative noncontingent probability learning experiment with an uncon-ventional feature: each 5 made 1000 consecutive predictions, making possible very detailed analysis of responses which occurred after learning was essentially completed. Some abbreviations will be useful. The 5 1 predicts either L or R; after each prediction he observes either 1 or r. The pro...

Polymer diodes require cathodes that do not corrode the polymer but do have low work function to minimize the electron injection barrier. First-principles calculations demonstrate that the work function of the (1000) surface of the compound Ca 2 N is half an eV lower than that of the elemental metal Ca (2.35 vs. 2.87 eV). Moreover its reactivity is expected to be smaller. This makes Ca 2 N an i...