Problem: Printed circuit board:

Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. Rub-on dry transfers of common component footprints increased efficiency. Traces were made with self-adhesive tape. Pre-printed non-reproducing grids on the mylar assisted in layout. To fabricate the board, the finished photomask was photolithographically reproduced onto a photoresist coating on the blank copper-clad boards.

Designers would rub on a dry transfer of what to make the process of laying out components simpler?
---
A: common component footprints

Problem: Pope Paul VI:

This was a significant step towards restoring communion between Rome and Constantinople. It produced the Catholic-Orthodox Joint declaration of 1965, which was read out on 7 December 1965, simultaneously at a public meeting of the Second Vatican Council in Rome and at a special ceremony in Istanbul. The declaration did not end the schism, but showed a desire for greater reconciliation between the two churches. In May 1973, the Coptic Patriarch Shenouda III of Alexandria visited the Vatican, where he met three times with Pope Paul VI. A common declaration and a joint Creed issued after the visit demonstrated that there are virtually no more[additional citation needed] theological discrepancies between the Coptic and Roman Catholic Churches.

Who visited the Vatican in May of 1973 in an effort to negotiate Orthodox and Catholic relations?
---
A: Coptic Patriarch Shenouda III

Problem: Antenna (radio):

On the other hand, classical (analog) television transmissions are usually horizontally polarized, because in urban areas buildings can reflect the electromagnetic waves and create ghost images due to multipath propagation. Using horizontal polarization, ghosting is reduced because the amount of reflection of electromagnetic waves in the p polarization (horizontal polarization off the side of a building) is generally less than s (vertical, in this case) polarization. Vertically polarized analog television has nevertheless been used in some rural areas. In digital terrestrial television such reflections are less problematic, due to robustness of binary transmissions and error correction.

Buildings can create ghost images because of what?
---
A: multipath propagation

Problem: Late Middle Ages:

Changes also took place within the recruitment and composition of armies. The use of the national or feudal levy was gradually replaced by paid troops of domestic retinues or foreign mercenaries. The practice was associated with Edward III of England and the condottieri of the Italian city-states. All over Europe, Swiss soldiers were in particularly high demand. At the same time, the period also saw the emergence of the first permanent armies. It was in Valois France, under the heavy demands of the Hundred Years' War, that the armed forces gradually assumed a permanent nature.

Which English king is associated with the use of mercenaries in the 14th century?
---
A:
Edward III