Utilities that allow users to view and control web-connected computers from a range of mobile devices—for example, smart phones and tablets—are some of the most popular applications. Woburn, Mass.-based LogMeIn, which makes the free screen-sharing service join.me, is among the more successful app makers in this category. Photo courtesy LogMeIn Join.me viewer app talks iPhone, iPad and Android. LogMeIn has released a new version of join.me for iPhones and iPads. The company says the free app now features a Voice-over IP (VoIP) option that lets users converse during their screen-sharing sessions. A zoom feature for closer screen inspection is also
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.