The simplest method, used for small-scale production and often by hobbyists, is immersion etching, in which the board is submerged in etching solution such as ferric chloride. Compared with methods used for mass production, the etching time is long. Heat and agitation can be applied to the bath to speed the etching rate. In bubble etching, air is passed through the etchant bath to agitate the solution and speed up etching. Splash etching uses a motor-driven paddle to splash boards with etchant; the process has become commercially obsolete since it is not as fast as spray etching. In spray etching, the etchant solution is distributed over the boards by nozzles, and recirculated by pumps. Adjustment of the nozzle pattern, flow rate, temperature, and etchant composition gives predictable control of etching rates and high production rates.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): If you wanted to speed up the etching process, you could agitate the bath up or add what to it?
Ah, so.. Heat

In 2002 Switzerland became a full member of the United Nations, leaving the Vatican City as the last widely recognised state without full UN membership. Switzerland is a founding member of the EFTA, but is not a member of the European Economic Area. An application for membership in the European Union was sent in May 1992, but not advanced since the EEA was rejected in December 1992 when Switzerland was the only country to launch a referendum on the EEA. There have since been several referenda on the EU issue; due to a mixed reaction from the population the membership application has been frozen. Nonetheless, Swiss law is gradually being adjusted to conform with that of the EU, and the government has signed a number of bilateral agreements with the European Union. Switzerland, together with Liechtenstein, has been completely surrounded by the EU since Austria's entry in 1995. On 5 June 2005, Swiss voters agreed by a 55% majority to join the Schengen treaty, a result that was regarded by EU commentators as a sign of support by Switzerland, a country that is traditionally perceived as independent and reluctant to enter supranational bodies.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What did Swiss voters agree to join on June 5, 2005?
Ah, so.. Schengen treaty

Thuringia generally accepted the Protestant Reformation, and Roman Catholicism was suppressed as early as 1520[citation needed]; priests who remained loyal to it were driven away and churches and monasteries were largely destroyed, especially during the German Peasants' War of 1525. In Mühlhausen and elsewhere, the Anabaptists found many adherents. Thomas Müntzer, a leader of some non-peaceful groups of this sect, was active in this city. Within the borders of modern Thuringia the Roman Catholic faith only survived in the Eichsfeld district, which was ruled by the Archbishop of Mainz, and to a small degree in Erfurt and its immediate vicinity.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When were most churches and monasteries protected?
Ah, so..
unanswerable