Problem: The calendar was a refinement to the Julian calendar amounting to a 0.002% correction in the length of the year. The motivation for the reform was to bring the date for the celebration of Easter to the time of the year in which it was celebrated when it was introduced by the early Church. Because the celebration of Easter was tied to the spring equinox, the Roman Catholic Church considered the steady drift in the date of Easter caused by the year being slightly too long to be undesirable. The reform was adopted initially by the Catholic countries of Europe. Protestants and Eastern Orthodox countries continued to use the traditional Julian calendar and adopted the Gregorian reform after a time, for the sake of convenience in international trade. The last European country to adopt the reform was Greece, in 1923.
What was the correction due to?
The answer is the following: length of the year

Problem: OU Medicine, an academic medical institution located on the campus of The University of Oklahoma Health Sciences Center, is home to OU Medical Center. OU Medicine operates Oklahoma's only level-one trauma center at the OU Medical Center and the state's only level-one trauma center for children at Children's Hospital at OU Medicine, both of which are located in the Oklahoma Health Center district. Other medical facilities operated by OU Medicine include OU Physicians and OU Children's Physicians, the OU College of Medicine, the Oklahoma Cancer Center and OU Medical Center Edmond, the latter being located in the northern suburb of Edmond.
Where is the Children's hospital located?
The answer is the following: Oklahoma Health Center district

Problem: The College of Arts and Letters was established as the university's first college in 1842 with the first degrees given in 1849. The university's first academic curriculum was modeled after the Jesuit Ratio Studiorum from Saint Louis University. Today the college, housed in O'Shaughnessy Hall, includes 20 departments in the areas of fine arts, humanities, and social sciences, and awards Bachelor of Arts (B.A.) degrees in 33 majors, making it the largest of the university's colleges. There are around 2,500 undergraduates and 750 graduates enrolled in the college.
How many BA majors does the College of Arts and Letters at Notre Dame offer?
The answer is the following: 33

Problem: The Martorana church (decorated around 1143) looked originally even more Byzantine although important parts were later demolished. The dome mosaic is similar to that of the Cappella Palatina, with Christ enthroned in the middle and four bowed, elongated angels. The Greek inscriptions, decorative patterns, and evangelists in the squinches are obviously executed by the same Greek masters who worked on the Cappella Palatina. The mosaic depicting Roger II of Sicily, dressed in Byzantine imperial robes and receiving the crown by Christ, was originally in the demolished narthex together with another panel, the Theotokos with Georgios of Antiochia, the founder of the church.
Who is featured in the mosaic at the Martorana church?
The answer is the following:
Christ