Footprints of quantum pigeons

Even quantum pigeons may thrive together.

In a recent issue of PNAS, Aharonov et al. (1) present interesting results on correlations between three particles (“pigeons”), 1, 2 and 3, each having access to two quantum states (“boxes” and “pigeonholes”) j L > and j R >. For a preselected three-particle state jin > = j + >1 j + >2 j +>3, where j +>1= (j L>1+ j R>1)/√2, etc. for the other particles, and for the postselected state j f > = j ...

Evaluation of Seroepidemiologic Ornithosis of Wild Pigeons in Tehran Area

For the first time in Iran, a number of 1736 sera samples of wild pigeons which were collected from different parts at Tehran, were investigated to determine the specific antiornithosis antibody using complement fixation test. In this study, 26,5 percent of samples represented ornithosis. 

Frozen Footprints

Bibliometrics has the ambitious goal of measuring science. To this end, it exploits the way science is disseminated trough scientific publications and the resulting citation network of scientific papers. We survey the main historical contributions to the field, the most interesting bibliometric indicators, and the most popular bibliometric data sources. Moreover, we discuss distributions common...

The Footprints of Dragons

Almost all our early ancestors believed the earth was inhabited, especially in unknown regions, by dragons. Where did they get such an idea? Did it stem from a universal human imagination? An inherited need or instinct? An inherited subconscious memory of dinosaurs? All these suggestions have been made, and taken seriously by groups of people. I believe dragons are the reflection, sometimes emb...

Footprints of Industry