While chemical forms of cell-to-cell communication are well recognized to coordinate bacterial populations, electrical signaling has been relatively ignored. Humphries et al. show that Bacillus subtilis biofilms utilize potassium production to attract far away, motile cells of even phylogenetically distant species by altering their membrane potential.

Northern Ireland is unique among the regions of the UK in still having an almost entirely selective secondary education system, where roughly one third of pupils attend grammar schools. This paper sets out to study whether attending a grammar school up to age 16 has any effect, ceteris paribus, on the transition of young people from compulsory schooling to further schooling, Further Education, ...

Developers often find themselves lost as they navigate around large programs, particularly when those programs are unfamiliar. This paper presents a new visualization, called a software terrain map, intended to keep a programmer oriented as she navigates around source code in the editor. The design is based on the metaphor of cartographic maps, which are continuous (no wasted space), have enoug...

I N B R I E F We are used to thinking of intelligence as largely a matter of genetic inheritance, but that is not the whole picture. What we do aff ects our mental wellbeing: staying physically and mentally active helps us stay sharp as we age. Nevertheless, our personal eff orts to bolster cognitive enhancement cannot forestall all declines in our cognitive performance. What is especially surp...