Problem: Matter:

A source of definition difficulty in relativity arises from two definitions of mass in common use, one of which is formally equivalent to total energy (and is thus observer dependent), and the other of which is referred to as rest mass or invariant mass and is independent of the observer. Only "rest mass" is loosely equated with matter (since it can be weighed). Invariant mass is usually applied in physics to unbound systems of particles. However, energies which contribute to the "invariant mass" may be weighed also in special circumstances, such as when a system that has invariant mass is confined and has no net momentum (as in the box example above). Thus, a photon with no mass may (confusingly) still add mass to a system in which it is trapped. The same is true of the kinetic energy of particles, which by definition is not part of their rest mass, but which does add rest mass to systems in which these particles reside (an example is the mass added by the motion of gas molecules of a bottle of gas, or by the thermal energy of any hot object).

What type of systems is rest mass applied to?
---
A: unanswerable


Problem: Located approximately 250 kilometres (160 mi) east of Puerto Rico and the nearer Virgin Islands, St. Barthélemy lies immediately southeast of the islands of Saint Martin and Anguilla. It is one of the Renaissance Islands. St. Barthélemy is separated from Saint Martin by the Saint-Barthélemy Channel. It lies northeast of Saba and St Eustatius, and north of St Kitts. Some small satellite islets belong to St. Barthélemy including Île Chevreau (Île Bonhomme), Île Frégate, Île Toc Vers, Île Tortue and Gros Îlets (Îlots Syndare). A much bigger islet, Île Fourchue, lies on the north of the island, in the Saint-Barthélemy Channel. Other rocky islets which include Coco, the Roques (or little Turtle rocks), the Goat, and the Sugarloaf.
How far is St. Bart's from Saint Martin?
---
Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
On November 3, 2008, the European Commission at Brussels predicted for 2009 an extremely weak growth of GDP, by 0.1%, for the countries of the Eurozone (France, Germany, Italy, Belgium etc.) and even negative number for the UK (−1.0%), Ireland and Spain. On November 6, the IMF at Washington, D.C., launched numbers predicting a worldwide recession by −0.3% for 2009, averaged over the developed economies. On the same day, the Bank of England and the European Central Bank, respectively, reduced their interest rates from 4.5% down to 3%, and from 3.75% down to 3.25%. As a consequence, starting from November 2008, several countries launched large "help packages" for their economies.
How much did the European Commission estimate the GDP growth for Eurozone countries would be in 2009?
A: 0.1%


Context and question: Since the construction of its oldest buildings, the university's physical plant has grown substantially. Over the years 29 residence halls have been built to accommodate students and each has been constructed with its own chapel. Many academic building were added together with a system of libraries, the most prominent of which is the Theodore Hesburgh Library, built in 1963 and today containing almost 4 million books. Since 2004, several buildings have been added, including the DeBartolo Performing Arts Center, the Guglielmino Complex, and the Jordan Hall of Science. Additionally, a new residence for men, Duncan Hall, was begun on March 8, 2007, and began accepting residents for the Fall 2008 semester. Ryan Hall was completed and began housing undergraduate women in the fall of 2009. A new engineering building, Stinson-Remick Hall, a new combination Center for Social Concerns/Institute for Church Life building, Geddes Hall, and a law school addition have recently been completed as well. Additionally the new hockey arena opened in the fall of 2011. The Stayer Center for Executive Education, which houses the Mendoza College of Business Executive Education Department opened in March 2013 just South of the Mendoza College of Business building. Because of its long athletic tradition, the university features also many building dedicated to sport. The most famous is Notre Dame Stadium, home of the Fighting Irish football team; it has been renovated several times and today it can hold more than 80 thousand people. Prominent venues include also the Edmund P. Joyce Center, with indoor basketball and volleyball courts, and the Compton Family Ice Arena, a two-rink facility dedicated to hockey. Also, there are many outdoor fields, as the Frank Eck Stadium for baseball.
Which library was built at Notre Dame in 1963?
Answer: Theodore Hesburgh Library


Question: Water storage and supply for Melbourne is managed by Melbourne Water, which is owned by the Victorian Government. The organisation is also responsible for management of sewerage and the major water catchments in the region as well as the Wonthaggi desalination plant and North–South Pipeline. Water is stored in a series of reservoirs located within and outside the Greater Melbourne area. The largest dam, the Thomson River Dam, located in the Victorian Alps, is capable of holding around 60% of Melbourne's water capacity, while smaller dams such as the Upper Yarra Dam, Yan Yean Reservoir, and the Cardinia Reservoir carry secondary supplies.
Is there an answer to this question: Who manages the water storage and supply for Melbourne?

Answer: Melbourne Water


Question: Originally, every electronic component had wire leads, and the PCB had holes drilled for each wire of each component. The components' leads were then passed through the holes and soldered to the PCB trace. This method of assembly is called through-hole construction. In 1949, Moe Abramson and Stanislaus F. Danko of the United States Army Signal Corps developed the Auto-Sembly process in which component leads were inserted into a copper foil interconnection pattern and dip soldered. The patent they obtained in 1956 was assigned to the U.S. Army. With the development of board lamination and etching techniques, this concept evolved into the standard printed circuit board fabrication process in use today. Soldering could be done automatically by passing the board over a ripple, or wave, of molten solder in a wave-soldering machine. However, the wires and holes are wasteful since drilling holes is expensive and the protruding wires are merely cut off.
Is there an answer to this question: What type of construction was originally used for all electronic components?

Answer:
through-hole