Problem: Please answer a question about the following article about Vacuum:
In general relativity, a vanishing stress-energy tensor implies, through Einstein field equations, the vanishing of all the components of the Ricci tensor. Vacuum does not mean that the curvature of space-time is necessarily flat: the gravitational field can still produce curvature in a vacuum in the form of tidal forces and gravitational waves (technically, these phenomena are the components of the Weyl tensor). The black hole (with zero electric charge) is an elegant example of a region completely "filled" with vacuum, but still showing a strong curvature.
what is a perfect example of a filled vacuum showing a curvature?
A: The black hole
Problem: Please answer a question about the following article about Madonna (entertainer):
Working with photographer Steven Klein, Madonna completed a 17-minute film called secretprojectrevolution. The BitTorrent company was selected by Madonna to release the film as part of a Madonna bundle. It was released on September 24, 2013, and consisted of the 17-minute film, its stills, a Vice interview, and a message from Madonna. With the film she launched the Art for Freedom initiative, which helped to promote "art and free speech as a means to address persecution and injustice across the globe". The website for the project has had over 3,000 art related submissions since its inception, with Madonna regularly monitoring and enlisting the help of other artists like David Blaine and Katy Perry as guest curators.
What initiative did Madonna launched with her film?
A: Art for Freedom
Problem: Please answer a question about the following article about Muslim world:
Other influential Muslim philosophers include al-Jahiz, a pioneer in evolutionary thought; Ibn al-Haytham (Alhazen), a pioneer of phenomenology and the philosophy of science and a critic of Aristotelian natural philosophy and Aristotle's concept of place (topos); Al-Biruni, a critic of Aristotelian natural philosophy; Ibn Tufail and Ibn al-Nafis, pioneers of the philosophical novel; Shahab al-Din Suhrawardi, founder of Illuminationist philosophy; Fakhr al-Din al-Razi, a critic of Aristotelian logic and a pioneer of inductive logic; and Ibn Khaldun, a pioneer in the philosophy of history.
What type of work is Ibn al-Haytham known to have pioneered?
A: phenomenology and the philosophy of science
Problem: Please answer a question about the following article about Virgil:
Book 7 (beginning the Iliadic half) opens with an address to the muse and recounts Aeneas' arrival in Italy and betrothal to Lavinia, daughter of King Latinus. Lavinia had already been promised to Turnus, the king of the Rutulians, who is roused to war by the Fury Allecto, and Amata Lavinia's mother. In Book 8, Aeneas allies with King Evander, who occupies the future site of Rome, and is given new armor and a shield depicting Roman history. Book 9 records an assault by Nisus and Euryalus on the Rutulians, Book 10, the death of Evander's young son Pallas, and 11 the death of the Volscian warrior princess Camilla and the decision to settle the war with a duel between Aeneas and Turnus. The Aeneid ends in Book 12 with the taking of Latinus' city, the death of Amata, and Aeneas' defeat and killing of Turnus, whose pleas for mercy are spurned. The final book ends with the image of Turnus' soul lamenting as it flees to the underworld.
Which King does Aeneas ally with in Book 8 of the Aeneid?
A:
King Evander