Problem: Printed circuit board:

Through-hole manufacture adds to board cost by requiring many holes to be drilled accurately, and limits the available routing area for signal traces on layers immediately below the top layer on multi-layer boards since the holes must pass through all layers to the opposite side. Once surface-mounting came into use, small-sized SMD components were used where possible, with through-hole mounting only of components unsuitably large for surface-mounting due to power requirements or mechanical limitations, or subject to mechanical stress which might damage the PCB.

What force might damage a PCB if large components are surface mounted?
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A: mechanical stress

Problem: Gramophone record:

When auto-changing turntables were commonplace, records were typically pressed with a raised (or ridged) outer edge and a raised label area, allowing records to be stacked onto each other without the delicate grooves coming into contact, reducing the risk of damage. Auto-changers included a mechanism to support a stack of several records above the turntable itself, dropping them one at a time onto the active turntable to be played in order. Many longer sound recordings, such as complete operas, were interleaved across several 10-inch or 12-inch discs for use with auto-changing mechanisms, so that the first disk of a three-disk recording would carry sides 1 and 6 of the program, while the second disk would carry sides 2 and 5, and the third, sides 3 and 4, allowing sides 1, 2, and 3 to be played automatically; then the whole stack reversed to play sides 4, 5, and 6.

Do records touch when in auto changers?
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A: Auto-changers included a mechanism to support a stack

Problem: Paris:

On 7 January 2015, two French Muslim extremists attacked the Paris headquarters of Charlie Hebdo and killed thirteen people, and on 9 January, a third terrorist killed four hostages during an attack at a Jewish grocery store at Porte de Vincennes. On 11 January an estimated 1.5 million people marched in Parisalong with international political leadersto show solidarity against terrorism and in defence of freedom of speech. Ten months later, 13 November 2015, came a series of coordinated terrorist attacks in Paris and Saint-Denis claimed by the 'Islamic state' organisation ISIL ('Daesh', ISIS); 130 people were killed by gunfire and bombs, and more than 350 were injured. Seven of the attackers killed themselves and others by setting off their explosive vests. On the morning of 18 November three suspected terrorists, including alleged planner of the attacks Abdelhamid Abaaoud, were killed in a shootout with police in the Paris suburb of Saint-Denis. President Hollande declared France to be in a three-month state of emergency.

On what date did two Muslim extremists attack Charlie Hebdo?
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A: 7 January 2015

Problem: Textual criticism:

Stemmatics, stemmology or stemmatology is a rigorous approach to textual criticism. Karl Lachmann (17931851) greatly contributed to making this method famous, even though he did not invent it. The method takes its name from the word stemma. The Ancient Greek word and its loanword in classical Latin stemmata may refer to "family trees". This specific meaning shows the relationships of the surviving witnesses (the first known example of such a stemma, albeit with the name, dates from 1827). The family tree is also referred to as a cladogram. The method works from the principle that "community of error implies community of origin." That is, if two witnesses have a number of errors in common, it may be presumed that they were derived from a common intermediate source, called a hyparchetype. Relations between the lost intermediates are determined by the same process, placing all extant manuscripts in a family tree or stemma codicum descended from a single archetype. The process of constructing the stemma is called recension, or the Latin recensio.

A loose approach to textual criticism is called what?
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A:
unanswerable