This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Many applications of silicate glasses derive from their optical transparency, which gives rise to one of silicate glasses' primary uses as window panes. Glass will transmit, reflect and refract light; these qualities can be enhanced by cutting and polishing to make optical lenses, prisms, fine glassware, and optical fibers for high speed data transmission by light. Glass can be colored by adding metallic salts, and can also be painted and printed with vitreous enamels. These qualities have led to the extensive use of glass in the manufacture of art objects and in particular, stained glass windows. Although brittle, silicate glass is extremely durable, and many examples of glass fragments exist from early glass-making cultures. Because glass can be formed or molded into any shape, and also because it is a sterile product, it has been traditionally used for vessels: bowls, vases, bottles, jars and drinking glasses. In its most solid forms it has also been used for paperweights, marbles, and beads. When extruded as glass fiber and matted as glass wool in a way to trap air, it becomes a thermal insulating material, and when these glass fibers are embedded into an organic polymer plastic, they are a key structural reinforcement part of the composite material fiberglass. Some objects historically were so commonly made of silicate glass that they are simply called by the name of the material, such as drinking glasses and reading glasses.
What ingredient makes glass colorful?

Another issue has been the use of a hypopodium as a standing platform to support the feet, given that the hands may not have been able to support the weight. In the 17th century Rasmus Bartholin considered a number of analytical scenarios of that topic. In the 20th century, forensic pathologist Frederick Zugibe performed a number of crucifixion experiments by using ropes to hang human subjects at various angles and hand positions. His experiments support an angled suspension, and a two-beamed cross, and perhaps some form of foot support, given that in an Aufbinden form of suspension from a straight stake (as used by the Nazis in the Dachau concentration camp during World War II), death comes rather quickly.
What was said to be used as a platform for crucifixion?

In 1271, Kublai Khan imposed the name Great Yuan (Chinese: ; pinyin: Da Yuan; WadeGiles: Ta-Yuan), establishing the Yuan dynasty. "Da Yuan" () is from the sentence "" (da zai Qian Yuan / "Great is Qian, the Primal") in the Commentaries on the Classic of Changes (I Ching) section regarding Qian (). The counterpart in Mongolian language was Dai On Ulus, also rendered as Ikh Yuan Uls or Yekhe Yuan Ulus. In Mongolian, Dai On (Great Yuan) is often used in conjunction with the "Yeke Mongghul Ulus" (lit. "Great Mongol State"), resulting in Dai On Yeke Mongghul Ulus (Mongolian script: ), meaning "Great Yuan Great Mongol State". The Yuan dynasty is also known as the "Mongol dynasty" or "Mongol Dynasty of China", similar to the names "Manchu dynasty" or "Manchu Dynasty of China" for the Qing dynasty. Furthermore, the Yuan is sometimes known as the "Empire of the Great Khan" or "Khanate of the Great Khan", which particularly appeared on some Yuan maps, since Yuan emperors held the nominal title of Great Khan. Nevertheless, both terms can also refer to the khanate within the Mongol Empire directly ruled by Great Khans before the actual establishment of the Yuan dynasty by Kublai Khan in 1271.
When did Khan establish the Great Yuan?