Problem: Printed circuit board:

Moisture absorption occurs when the material is exposed to high humidity or water. Both the resin and the reinforcement may absorb water; water may be also soaked by capillary forces through voids in the materials and along the reinforcement. Epoxies of the FR-4 materials aren't too susceptible, with absorption of only 0.15%. Teflon has very low absorption of 0.01%. Polyimides and cyanate esters, on the other side, suffer from high water absorption. Absorbed water can lead to significant degradation of key parameters; it impairs tracking resistance, breakdown voltage, and dielectric parameters. Relative dielectric constant of water is about 73, compared to about 4 for common circuitboard materials. Absorbed moisture can also vaporize on heating and cause cracking and delamination, the same effect responsible for "popcorning" damage on wet packaging of electronic parts. Careful baking of the substrates may be required.

What will happen to the materials when a board gets wet or is in a humid area?
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A: Moisture absorption


Problem: The creation of the Federal Republic of Germany in 1949 was through the unification of the western states (which were previously under American, British, and French administration) created in the aftermath of World War II. Initially, in 1949, the states of the Federal Republic were Baden, Bavaria (in German: Bayern), Bremen, Hamburg, Hesse (Hessen), Lower Saxony (Niedersachsen), North Rhine Westphalia (Nordrhein-Westfalen), Rhineland-Palatinate (Rheinland-Pfalz), Schleswig-Holstein, Württemberg-Baden, and Württemberg-Hohenzollern. West Berlin, while officially not part of the Federal Republic, was largely integrated and considered as a de facto state.
What area has always been a part of the Federal Republic of Germany?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The term "post-punk" was first used by journalists in the late 1970s to describe groups moving beyond punk's sonic template into disparate areas. Many of these artists, initially inspired by punk's DIY ethic and energy, ultimately became disillusioned with the style and movement, feeling that it had fallen into commercial formula, rock convention and self-parody. They repudiated its populist claims to accessibility and raw simplicity, instead seeing an opportunity to break with musical tradition, subvert commonplaces and challenge audiences. Artists moved beyonds punk's focus on the concerns of a largely white, male, working class population and abandoned its continued reliance on established rock and roll tropes, such as three-chord progressions and Chuck Berry-based guitar riffs. These artists instead defined punk as "an imperative to constant change", believing that "radical content demands radical form".
When was the term punk first used?
A: unanswerable


Context and question: There is considerable speculation both in science and science fiction as to why the observable universe is apparently almost entirely matter, and whether other places are almost entirely antimatter instead. In the early universe, it is thought that matter and antimatter were equally represented, and the disappearance of antimatter requires an asymmetry in physical laws called the charge parity (or CP symmetry) violation. CP symmetry violation can be obtained from the Standard Model, but at this time the apparent asymmetry of matter and antimatter in the visible universe is one of the great unsolved problems in physics. Possible processes by which it came about are explored in more detail under baryogenesis.
When was there more antimatter than matter?
Answer: unanswerable


Question: The port of Palermo, founded by the Phoenicians over 2,700 years ago, is, together with the port of Messina, the main port of Sicily. From here ferries link Palermo to Cagliari, Genoa, Livorno, Naples, Tunis and other cities and carry a total of almost 2 million passengers annually. It is also an important port for cruise ships. Traffic includes also almost 5 million tonnes of cargo and 80.000 TEU yearly. The port also has links to minor sicilian islands such as Ustica and the Aeolian Islands (via Cefalù in summer). Inside the Port of Palermo there is a section known as "tourist marina" for sailing yachts and catamarans.
Is there an answer to this question: What is the main port of Italy?

Answer: unanswerable


Question: Bell's patent 174,465, was issued to Bell on March 7, 1876, by the U.S. Patent Office. Bell's patent covered "the method of, and apparatus for, transmitting vocal or other sounds telegraphically ... by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sound" [N 16] Bell returned to Boston the same day and the next day resumed work, drawing in his notebook a diagram similar to that in Gray's patent caveat.
Is there an answer to this question: What number is Bell's patent?

Answer:
174,465