QUES: The presence of pain in an animal cannot be known for certain, but it can be inferred through physical and behavioral reactions. Specialists currently believe that all vertebrates can feel pain, and that certain invertebrates, like the octopus, might too. As for other animals, plants, or other entities, their ability to feel physical pain is at present a question beyond scientific reach, since no mechanism is known by which they could have such a feeling. In particular, there are no known nociceptors in groups such as plants, fungi, and most insects, except for instance in fruit flies.

What do specialists say all invertebrates can feel?
What is the answer?
ANS: unanswerable
QUES: Several websites assert that Israel is the 51st state due to the annual funding and defense support it receives from the United States. An example of this concept can be found in 2003 when Martine Rothblatt published a book called Two Stars for Peace that argued for the addition of Israel and the Palestinian territories surrounding it as the 51st state in the Union. The American State of Canaan, is a book published by Prof. Alfred de Grazia, political science and sociologist, in March 2009, proposing the creation of the 51st and 52nd states from Israel and the Palestinian territories.

Who wrote the book Martine Rothblatt? 
What is the answer?
ANS: unanswerable
QUES: Despite New York's heavy reliance on its vast public transit system, streets are a defining feature of the city. Manhattan's street grid plan greatly influenced the city's physical development. Several of the city's streets and avenues, like Broadway, Wall Street, Madison Avenue, and Seventh Avenue are also used as metonyms for national industries there: the theater, finance, advertising, and fashion organizations, respectively.

What industry is Madison Avenue associated with?
What is the answer?
ANS:
advertising