The difficulty, experts said, is finding one that works at low doses and can be made quickly.
Still, the sources of water are an opportunity for the French and Chadian forces, as they can be monitored without too much difficulty, experts said.
UK households should brace themselves for a combination of rising inflation, low pay and increased debt that will squeeze living standards next year and push more people into financial difficulty, experts have warned.
Moreover, the difficulty experts have had in figuring out the origin of Stuxnet points to both the appeal and the danger of computer attacks in a new age of cyberwar.
Both classifications showed results that were very similar although not exactly the same, basically due to the difficulty experts experience in recognizing "intermediately-inefficient" DMU.
Even so, despite its wide-reaching influence — and, indeed owing to that influence — any attempt to describe categorialism faces a significant difficulty: experts disagree on many of its most important and fundamental aspects.
Among the difficulties, military experts say, are decoy tunnels and false entrances, the identification of which requires good intelligence.
Survivors of other traumatic events -- Ms. Mendez narrowly escaped death in the 1993 bombing of the World Trade Center -- are at particular risk for such difficulties, the experts say, as are people burdened by other stresses and those with existing psychiatric difficulties.
One tool for GPs is a pair of simple questions: "Have you ever felt the need to bet more and more money?" and "Have you ever had the need to lie to people important to you about how much you gamble?" GPs can then refer patients with difficulties to experts for help.
On Sept. 11 and again as anthrax moved through the mail, the government had difficulty gathering experts and had problems conveying information.
