Question: 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.
Is there an answer to this question: What's the approximate relative dielectric constant of most materials in circuit boards?

Answer: 4


Question: In accordance with tradition, they sign by placing the title "Cardinal" (abbreviated Card.) after their personal name and before their surname as, for instance, "John Card(inal) Doe" or, in Latin, "Ioannes Card(inalis) Cognomen". Some writers, such as James-Charles Noonan, hold that, in the case of cardinals, the form used for signatures should be used also when referring to them in English. Official sources such as the Archdiocese of Milwaukee and Catholic News Service say that the correct form for referring to a cardinal in English is normally as "Cardinal [First name] [Surname]". This is the rule given also in stylebooks not associated with the Catholic Church. This style is also generally followed on the websites of the Holy See and episcopal conferences. Oriental Patriarchs who are created Cardinals customarily use "Sanctae Ecclesiae Cardinalis" as their full title, probably because they do not belong to the Roman clergy.
Is there an answer to this question: What is not the correct way to address a cardinal according to the Archdiocese of Milwaukee?

Answer: unanswerable


Question: Since the 19th century, the built-up area of Paris has grown far beyond its administrative borders; together with its suburbs, the whole agglomeration has a population of 10,550,350 (Jan. 2012 census). Paris' metropolitan area spans most of the Paris region and has a population of 12,341,418 (Jan. 2012 census), or one-fifth of the population of France. The administrative region covers 12,012 km² (4,638 mi²), with approximately 12 million inhabitants as of 2014, and has its own regional council and president.
Is there an answer to this question: What is the aggregate population of Paris?

Answer: 10,550,350


Question: Eisenhower's main goals in office were to keep pressure on the Soviet Union and reduce federal deficits. In the first year of his presidency, he threatened the use of nuclear weapons in an effort to conclude the Korean War; his New Look policy of nuclear deterrence prioritized inexpensive nuclear weapons while reducing funding for conventional military forces. He ordered coups in Iran and Guatemala. Eisenhower refused to give major aid to help France in Vietnam. He gave strong financial support to the new nation of South Vietnam. Congress agreed to his request in 1955 for the Formosa Resolution, which obliged the U.S. to militarily support the pro-Western Republic of China in Taiwan and continue the isolation of the People's Republic of China.
Is there an answer to this question: What did Eisenhower threaten to use to end the Korean War?

Answer:
nuclear weapons