This change is interesting from a sociolinguistic point of view because it has apparently happened relatively recently, in the 1970s, and was pioneered by older well-educated women from the upper middle classes. The lowering of the diphthongs has long been current in many Dutch dialects, and is comparable to the English Great Vowel Shift, and the diphthongisation of long high vowels in Modern High German, which centuries earlier reached the state now found in Polder Dutch. Stroop theorizes that the lowering of open-mid to open diphthongs is a phonetically "natural" and inevitable development and that Dutch, after having diphthongised the long high vowels like German and English, "should" have lowered the diphthongs like German and English as well.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): In what decade did the Dutch diphthong lowering occur?
Ah, so.. 1970s

According to the United States Census Bureau, the city has a total area of 28.70 square miles (74.33 km2), of which, 27.83 square miles (72.08 km2) of it is land and 0.87 square miles (2.25 km2) is water, much of which is part of the Huron River. Ann Arbor is about 35 miles (56 km) west of Detroit. Ann Arbor Charter Township adjoins the city's north and east sides. Ann Arbor is situated on the Huron River in a productive agricultural and fruit-growing region. The landscape of Ann Arbor consists of hills and valleys, with the terrain becoming steeper near the Huron River. The elevation ranges from about 750 feet (230 m) along the Huron River to 1,015 feet (309 m) on the city's west side, near the intersection of Maple Road and Pauline Blvd. Generally, the west-central and northwestern parts of the city and U-M's North Campus are the highest parts of the city; the lowest parts are along the Huron River and in the southeast. Ann Arbor Municipal Airport, which is south of the city at 4213.38N 8344.74W / 42.22300N 83.74567W / 42.22300; -83.74567, has an elevation of 839 feet (256 m).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The highest parts of the city are along what river?
Ah, so.. unanswerable

At E3 2007, Sony was able to show a number of their upcoming video games for PlayStation 3, including Heavenly Sword, Lair, Ratchet & Clank Future: Tools of Destruction, Warhawk and Uncharted: Drake's Fortune; all of which were released in the third and fourth quarters of 2007. They also showed off a number of titles that were set for release in 2008 and 2009; most notably Killzone 2, Infamous, Gran Turismo 5 Prologue, LittleBigPlanet and SOCOM: U.S. Navy SEALs Confrontation. A number of third-party exclusives were also shown, including the highly anticipated Metal Gear Solid 4: Guns of the Patriots, alongside other high-profile third-party titles such as Grand Theft Auto IV, Call of Duty 4: Modern Warfare, Assassin's Creed, Devil May Cry 4 and Resident Evil 5. Two other important titles for PlayStation 3, Final Fantasy XIII and Final Fantasy Versus XIII, were shown at TGS 2007 in order to appease the Japanese market.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What Gran Turismo game was shown in 2007 but not released until after 2008?
Ah, so..
unanswerable