Problem: Mary (mother of Jesus):

Roman Catholics believe in the Immaculate Conception of Mary, as proclaimed Ex Cathedra by Pope Pius IX in 1854, namely that she was filled with grace from the very moment of her conception in her mother's womb and preserved from the stain of original sin. The Latin Rite of the Roman Catholic Church has a liturgical feast by that name, kept on December 8. Orthodox Christians reject the Immaculate Conception dogma principally because their understanding of ancestral sin (the Greek term corresponding to the Latin "original sin") differs from the Augustinian interpretation and that of the Roman Catholic Church.

Which pope proclaimed the Immaculate Conception of Mary?
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A: Pope Pius IX


Problem: Hunting:

The American bison is a large bovid which inhabited much of western North America prior to the 1800s, living on the prairies in large herds. However, the vast herds of bison attracted market hunters, who killed dozens of bison for their hides only, leaving the rest to rot. Thousands of these hunters quickly eliminated the bison herds, bringing the population from several million in the early 1800s to a few hundred by the 1880s. Conservation efforts have allowed the population to increase, but the bison remains near-threatened.

What part of North America did the bison live?
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A: western


Problem: Paris:

The first book printed in France, Epistolae ("Letters"), by Gasparinus de Bergamo (Gasparino da Barzizza), was published in Paris in 1470 by the press established by Johann Heynlin. Since then, Paris has been the centre of the French publishing industry, the home of some of the world's best-known writers and poets, and the setting for many classic works of French literature. Almost all the books published in Paris in the Middle Ages were in Latin, rather than French. Paris did not become the acknowledged capital of French literature until the 17th century, with authors such as Boileau, Corneille, La Fontaine, Molière, Racine, several coming from the provinces, and the foundation of the Académie française. In the 18th century, the literary life of Paris revolved around the cafés and salons, and was dominated by Voltaire, Jean-Jacques Rousseau, Pierre de Marivaux, and Beaumarchais.

When was Epistolae published?
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A: 1470


Problem: Bird migration:

The timing of migration seems to be controlled primarily by changes in day length. Migrating birds navigate using celestial cues from the sun and stars, the earth's magnetic field, and probably also mental maps.

How do migrating birds navigate?
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A:
celestial cues from the sun and stars