Input: Article: IMF's forecast said that Greece's unemployment rate would hit the highest 14.8 percent in 2012 and decrease to 14.1 in 2014. But in fact, the Greek economy suffered a prolonged high unemployemnt. The unemployment figure was between 9 per cent and 11 per cent in 2009, and it soared to 28 per cent in 2013. In 2015, Greece's jobless rate is around 24 per cent. It is thought that Greece's potential output has been eroded by this prolonged massive unemployment due to the associated hysteresis effects.

Now answer this question: What is thought to have eroded Greece's potential output?

Output: prolonged massive unemployment

Input: Article: Glass has the ability to refract, reflect, and transmit light following geometrical optics, without scattering it. It is used in the manufacture of lenses and windows. Common glass has a refraction index around 1.5. This may be modified by adding low-density materials such as boron, which lowers the index of refraction (see crown glass), or increased (to as much as 1.8) with high-density materials such as (classically) lead oxide (see flint glass and lead glass), or in modern uses, less toxic oxides of zirconium, titanium, or barium. These high-index glasses (inaccurately known as "crystal" when used in glass vessels) cause more chromatic dispersion of light, and are prized for their diamond-like optical properties.

Now answer this question: What can be used to make glass less refractive?

Output: boron

Input: Article: During the 1800s Christian missionaries from Great Britain and the United States followed traders to the Hawaiian islands. Long-termly, the Anglo-Saxon presence negatively impacted the level of regard Hawaiian royal women held for their own indigenous looks. For centuries prior the arrival of Christians, first nation Hawaiian aesthetics, such as dark skin and ample bodies, had been considered signs of nobility. No matter how much they adapted their mannerisms to Western standard, some of the Anglo-Saxon missionaries were relentless in referring to the indigenous women as "Hawaiian squaws." By the last half of the 19th century, some Hawaiian women began marrying European men who found them exotic. The men, however, selected Hawaiian women who were thinner and paler in complexion.

Now answer this question: When would white men marry the paler and thinner Hawaiian ladies?

Output:
By the last half of the 19th century