Input: Light-emitting diode
While LEDs have the advantage over fluorescent lamps that they do not contain mercury, they may contain other hazardous metals such as lead and arsenic. Regarding the toxicity of LEDs when treated as waste, a study published in 2011 stated: "According to federal standards, LEDs are not hazardous except for low-intensity red LEDs, which leached Pb [lead] at levels exceeding regulatory limits (186 mg/L; regulatory limit: 5). However, according to California regulations, excessive levels of copper (up to 3892 mg/kg; limit: 2500), lead (up to 8103 mg/kg; limit: 1000), nickel (up to 4797 mg/kg; limit: 2000), or silver (up to 721 mg/kg; limit: 500) render all except low-intensity yellow LEDs hazardous."

What dangerous metal can LEDs contain?
Output: arsenic


Input: Article: Bell's father, grandfather, and brother had all been associated with work on elocution and speech, and both his mother and wife were deaf, profoundly influencing Bell's life's work. His research on hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded the first U.S. patent for the telephone in 1876.[N 4] Bell considered his most famous invention an intrusion on his real work as a scientist and refused to have a telephone in his study.[N 5]

Now answer this question: What year did Bell get the patent for his telephone?

Output: 1876


Article: At the start of a classic valley glacier is a bowl-shaped cirque, which has escarped walls on three sides but is open on the side that descends into the valley. Cirques are where ice begins to accumulate in a glacier. Two glacial cirques may form back to back and erode their backwalls until only a narrow ridge, called an arête is left. This structure may result in a mountain pass. If multiple cirques encircle a single mountain, they create pointed pyramidal peaks; particularly steep examples are called horns.

Question: How many sides are closed in a typical cirque?
Ans: three sides


Here is a question about this article: Communism remained an important focus especially during the 1950s and 1960s. Colonialism and racism were important issues that arose. In general, there was a marked trend towards a pragmatic approach to political issues, rather than a philosophical one. Much academic debate regarded one or both of two pragmatic topics: how (or whether) to apply utilitarianism to problems of political policy, or how (or whether) to apply economic models (such as rational choice theory) to political issues. The rise of feminism, LGBT social movements and the end of colonial rule and of the political exclusion of such minorities as African Americans and sexual minorities in the developed world has led to feminist, postcolonial, and multicultural thought becoming significant. This led to a challenge to the social contract by philosophers Charles W. Mills in his book The Racial Contract and Carole Patemen in her book The Sexual Contract that the social contract excluded persons of colour and women respectively.
What is the answer to this question: There was a marked trend towards what type of approach to political issues?
****
So... pragmatic approach


The problem: Answer a question about this article:
The women of Tuvalu use cowrie and other shells in traditional handicrafts. The artistic traditions of Tuvalu have traditionally been expressed in the design of clothing and traditional handicrafts such as the decoration of mats and fans. Crochet (kolose) is one of the art forms practiced by Tuvaluan women. The material culture of Tuvalu uses traditional design elements in artefacts used in everyday life such as the design of canoes and fish hooks made from traditional materials. The design of women's skirts (titi), tops (teuga saka), headbands, armbands, and wristbands, which continue to be used in performances of the traditional dance songs of Tuvalu, represents contemporary Tuvaluan art and design.
What traditional purpose are Tuvalu designs still used?
****
The answer: dance songs


The problem: Answer a question about this article:
Historically, there has been much dispute over whether such a thing as a vacuum can exist. Ancient Greek philosophers debated the existence of a vacuum, or void, in the context of atomism, which posited void and atom as the fundamental explanatory elements of physics. Following Plato, even the abstract concept of a featureless void faced considerable skepticism: it could not be apprehended by the senses, it could not, itself, provide additional explanatory power beyond the physical volume with which it was commensurate and, by definition, it was quite literally nothing at all, which cannot rightly be said to exist. Aristotle believed that no void could occur naturally, because the denser surrounding material continuum would immediately fill any incipient rarity that might give rise to a void.
What did Aristotle believe about a void?
****
The answer:
no void could occur naturally,