Consider in R2 the standard lattice L = Z×Z and the origin (0,0). A point (m,n) ∈ L−{(0,0)} is said to be visible if the segment connecting the origin and (m,n) does not contain any other lattice points. Visibility problems have been studied since a century. Perhaps the most celebrated problems are the visible version of Gauss circle problem and the so-called orchard problem (see other problems...

Mission The Progeria Family Circle is a parents’ organisation and network that supports European Progeria children and their families in several ways. The objectives are fourfold: Meetings First, the foundation organises annual meetings for all European children and their families. These are important highlights, because of the rarity of the disease children never see other patients. Also for t...

Relative direction information is very commonly used. Observers typically describe their environment by specifying the relative directions in which they see other objects or other people from their point of view. Or they receive navigation instructions with respect to their point of view, for example, turn left at the next intersection. However, it is surprisingly hard to integrate relative dir...

Browsing the Web is usually a lonely task. People visit sites, collect information and are not aware of other people looking at the same material, people with whom they could exchange experiences and ideas about the subject they are looking at. A Collaborative Browsing System (CoBrow) [13] has been developed to bring awareness to the World Wide Web. CoBrow users can see other people looking at ...

In a case-control analysis comparing 303 patients with diabetes and 303 without (matched on age, race, sex and height), diabetics had reduced lung diffusion (DLCO) independent of smoking, obesity, clinical heart failure, asymptomatic left ventricular systolic and diastolic dysfunction: DLCO (mean±SE: 15.5±0.9 vs. 16.4 ±0.9, p=0.01).