Problem: Mexico City remains the only Latin American city to host the Olympic Games, having held the Summer Olympics in 1968, winning bids against Buenos Aires, Lyon and Detroit. (This too will change thanks to Rio, 2016 Summer Games host). The city hosted the 1955 and 1975 Pan American Games, the last after Santiago and São Paulo withdrew. The ICF Flatwater Racing World Championships were hosted here in 1974 and 1994. Lucha libre is a Mexican style of wrestling, and is one of the more popular sports throughout the country. The main venues in the city are Arena México and Arena Coliseo.
What year did Mexico City first host the Pan America games?
The answer is the following: 1955

Problem: Among the challenges being faced to improve the efficiency of LED-based white light sources is the development of more efficient phosphors. As of 2010, the most efficient yellow phosphor is still the YAG phosphor, with less than 10% Stoke shift loss. Losses attributable to internal optical losses due to re-absorption in the LED chip and in the LED packaging itself account typically for another 10% to 30% of efficiency loss. Currently, in the area of phosphor LED development, much effort is being spent on optimizing these devices to higher light output and higher operation temperatures. For instance, the efficiency can be raised by adapting better package design or by using a more suitable type of phosphor. Conformal coating process is frequently used to address the issue of varying phosphor thickness.
What is the percentage of stoke shift loss in YAG phosphor?
The answer is the following: less than 10%

Problem: One such reaction to the cold aesthetic of modernism and Brutalism is the school of metaphoric architecture, which includes such things as biomorphism and zoomorphic architecture, both using nature as the primary source of inspiration and design. While it is considered by some to be merely an aspect of postmodernism, others consider it to be a school in its own right and a later development of expressionist architecture.
What are two examples of metaphoric architecture?
The answer is the following: biomorphism and zoomorphic architecture

Problem: The city, especially the East Boston neighborhood, has a significant Hispanic community. Hispanics in Boston are mostly of Puerto Rican (30,506 or 4.9% of total city population), Dominican (25,648 or 4.2% of total city population), Salvadoran (10,850 or 1.8% of city population), Colombian (6,649 or 1.1% of total city population), Mexican (5,961 or 1.0% of total city population), and Guatemalan (4,451 or 0.7% of total city population) ethnic origin. When including all Hispanic national origins, they number 107,917. In Greater Boston, these numbers grow significantly with Puerto Ricans numbering 175,000+, Dominicans 95,000+, Salvadorans 40,000+, Guatemalans 31,000+, Mexicans 25,000+, and Colombians numbering 22,000+.
How many Puerto Rican hispanics live in greater Boston?
The answer is the following:
175,000+