In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

The total length of the continental border is 1,954 miles (3,145 km). From the Gulf of Mexico, it follows the course of the Rio Grande (Río Bravo del Norte) to the border crossing at Ciudad Juárez, Chihuahua, and El Paso, Texas. Westward from El Paso -- Juárez, it crosses vast tracts of the Chihuahuan and Sonoran deserts to the Colorado River Delta and San Diego -- Tijuana, before reaching the Pacific Ocean.
where is the border between mexico and us

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger -- Marsden gold foil experiment. After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force.
who said most of an atoms mass is in the nucleus

The House of Wisdom (Arabic: بيت الحكمة ‎; Bayt al-Hikma) refers either to a major Abbasid public academy and intellectual center in Baghdad or to a large private library belonging to the Abbasid Caliphs during the Islamic Golden Age. The House of Wisdom is the subject of an active dispute over its functions and existence as a formal academy, an issue complicated by a lack of physical evidence following the collapse of the Abbasid Caliphate and a reliance on corroboration of literary sources to construct a narrative. The House of Wisdom was founded either as a library for the collections of the Caliph Harun al-Rashid in the late 8th century and later turned into a public academy during the reign of Al-Ma'mun or was a private collection created by Al-Mansur (reign 754 -- 775) to house rare books and collections of poetry in both Arabic and Persian. Regardless, the House of Wisdom existed as a part of the major Translation Movement taking place during the Abbasid Era, translating works from Greek and Syriac to Arabic, but it is unlikely that The House of Wisdom existed as the sole center of such work, as major translation efforts arose in Cairo and Damascus even earlier than the proposed establishment of the House of Wisdom. This translation movement lent momentum to a great deal of original research occurring in the Islamicate world, which had access to texts from Greek, Persian and Indian sources, as opposed to the 'Bookshelf Thesis' that reduces the contributions of Islamicate scholars to mere translation and preservation of Greek texts.

what was the purpose of the house of wisdom

