Input: Read this: It has been possible to teach a migration route to a flock of birds, for example in re-introduction schemes. After a trial with Canada geese Branta canadensis, microlight aircraft were used in the US to teach safe migration routes to reintroduced whooping cranes Grus americana.
Question: What did they use to teach birds a migration route?

Output: microlight aircraft

Input: Read this: The Federal Supreme Court has established that treaties are subject to constitutional review and enjoy the same hierarchical position as ordinary legislation (leis ordinarias, or "ordinary laws", in Portuguese). A more recent ruling by the Supreme Court in 2008 has altered that scheme somewhat, by stating that treaties containing human rights provisions enjoy a status above that of ordinary legislation, though they remain beneath the constitution itself. Additionally, as per the 45th amendment to the constitution, human rights treaties which are approved by Congress by means of a special procedure enjoy the same hierarchical position as a constitutional amendment. The hierarchical position of treaties in relation to domestic legislation is of relevance to the discussion on whether (and how) the latter can abrogate the former and vice versa.
Question: What amendment to the Brazilian constitution states that human rights treaties approved by means of a special procedure by Congress enjoy the same position as a constitutional amendment?

Output: the 45th amendment

Input: Read this: Critics of the Aeneid focus on a variety of issues. The tone of the poem as a whole is a particular matter of debate; some see the poem as ultimately pessimistic and politically subversive to the Augustan regime, while others view it as a celebration of the new imperial dynasty. Virgil makes use of the symbolism of the Augustan regime, and some scholars see strong associations between Augustus and Aeneas, the one as founder and the other as re-founder of Rome. A strong teleology, or drive towards a climax, has been detected in the poem. The Aeneid is full of prophecies about the future of Rome, the deeds of Augustus, his ancestors, and famous Romans, and the Carthaginian Wars; the shield of Aeneas even depicts Augustus' victory at Actium against Mark Antony and Cleopatra VII in 31 BC. A further focus of study is the character of Aeneas. As the protagonist of the poem, Aeneas seems to waver constantly between his emotions and commitment to his prophetic duty to found Rome; critics note the breakdown of Aeneas' emotional control in the last sections of the poem where the "pious" and "righteous" Aeneas mercilessly slaughters Turnus.
Question: Where did Aeneas defeat Turnus?

Output: unanswerable

Input: Read this: The five Great Lakes are located in the north-central portion of the country, four of them forming part of the border with Canada, only Lake Michigan situated entirely within United States. The southeast United States contain subtropical forests and, near the gulf coast, mangrove wetlands, especially in Florida. West of the Appalachians lies the Mississippi River basin and two large eastern tributaries, the Ohio River and the Tennessee River. The Ohio and Tennessee Valleys and the Midwest consist largely of rolling hills and productive farmland, stretching south to the Gulf Coast.
Question: What are the two large Western tributaries of the Mississippi River?

Output:
unanswerable