Problem: Richard Feynman:

He also developed Feynman diagrams, a bookkeeping device that helps in conceptualizing and calculating interactions between particles in spacetime, including the interactions between electrons and their antimatter counterparts, positrons. This device allowed him, and later others, to approach time reversibility and other fundamental processes. Feynman's mental picture for these diagrams started with the hard sphere approximation, and the interactions could be thought of as collisions at first. It was not until decades later that physicists thought of analyzing the nodes of the Feynman diagrams more closely. Feynman painted Feynman diagrams on the exterior of his van.

What did Feynman produce that help in understanding calculations between particles in space and time?
---
A: Feynman diagrams

Problem: The Byzantine Empire ruled the northern shores of the Sahara from the 5th to the 7th centuries. After the Muslim conquest of Arabia (Arabian peninsula) the Muslim conquest of North Africa began in the mid-7th to early 8th centuries, Islamic influence expanded rapidly on the Sahara. By the end of 641 all of Egypt was in Muslim hands. The trade across the desert intensified. A significant slave trade crossed the desert. It has been estimated that from the 10th to 19th centuries some 6,000 to 7,000 slaves were transported north each year.
How long did the Muslims control Egypt?
---
Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Birds occupy a wide range of ecological positions. While some birds are generalists, others are highly specialised in their habitat or food requirements. Even within a single habitat, such as a forest, the niches occupied by different species of birds vary, with some species feeding in the forest canopy, others beneath the canopy, and still others on the forest floor. Forest birds may be insectivores, frugivores, and nectarivores. Aquatic birds generally feed by fishing, plant eating, and piracy or kleptoparasitism. Birds of prey specialise in hunting mammals or other birds, while vultures are specialised scavengers. Avivores are animals that are specialized at preying on birds.
What type of birds may be either insectivores, frugivores and nectarivores?
A: Forest birds

Context and question: On July 20, 2009, Sports Business Journal reported that the AFL owed approximately $14 million to its creditors and were considering filing for Chapter 11 bankruptcy protection. In early August 2009, numerous media outlets began reporting that the AFL was folding permanently and would file for Chapter 7 bankruptcy. The league released a statement on August 4 to the effect that while the league was not folding, it was suspending league operations indefinitely. Despite this, several of the league's creditors filed papers to force a Chapter 7 liquidation if the league did not do so voluntarily. This request was granted on August 7, though converted to a Chapter 11 reorganization on August 26.
On what date did the AFL announce that it was not shutting down?
Answer: August 4

Question: During the 20th century Valencia remained the third most populous city of Spain as its population tripled, rising from 213,550 inhabitants in 1900 to 739,014 in 2000. Valencia was also third in industrial and economic development; notable milestones include urban expansion of the city in the latter 1800s, the creation of the Banco de Valencia in 1900, construction of the Central and Columbus markets, and the construction of the Gare du Nord railway station, completed in 1921. The new century was marked in Valencia with a major event, the Valencian regional exhibition of 1909 (La Exposicion Regional Valenciana de 1909), which emulated the national and universal expositions held in other cities. This production was promoted by the Ateneo Mercantil de Valencia (Mercantile Athenaeum of Valencia), especially by its chairman, Tomas Trenor y Palavicino, and had the support of the Government and the Crown; it was officially inaugurated by King Alfonso XIII himself.
Is there an answer to this question: Where did Valencia rank in economic development among Spanish cities in the 1900s?

Answer: third

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In India there are many polytechnic institutes and collages that offer a polytechnic education. In India a Diploma in Engineering is a specific academic award usually awarded in technical or vocational courses e.g. Engineering, Pharmacy, Designing, etc. These Institutions offer three year diploma in engineering post Tenth class. These institutes have affiliation from state bord of technical education of respective state governments. after which one can apply for post of junior engineer or continue higher studies by appearing for exams of AMIE to become an engineering graduate.
What's the name of the diploma awarded in India for technical or vocational coursework?
A:
Diploma in Engineering