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."
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): According to a California study, what harmful metal is in most non-LEDs?
Ah, so.. unanswerable

Besides its prominence in sports, Notre Dame is also a large, four-year, highly residential research University, and is consistently ranked among the top twenty universities in the United States and as a major global university. The undergraduate component of the university is organized into four colleges (Arts and Letters, Science, Engineering, Business) and the Architecture School. The latter is known for teaching New Classical Architecture and for awarding the globally renowned annual Driehaus Architecture Prize. Notre Dame's graduate program has more than 50 master's, doctoral and professional degree programs offered by the five schools, with the addition of the Notre Dame Law School and a MD-PhD program offered in combination with IU medical School. It maintains a system of libraries, cultural venues, artistic and scientific museums, including Hesburgh Library and the Snite Museum of Art. Over 80% of the university's 8,000 undergraduates live on campus in one of 29 single-sex residence halls, each with its own traditions, legacies, events and intramural sports teams. The university counts approximately 120,000 alumni, considered among the strongest alumni networks among U.S. colleges.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many doctorate and masters programs are available at Notre Dame?
Ah, so.. more than 50

Jobs expanded so rapidly that 400,000 people were attracted to the city from 1941 to 1943, including 50,000 blacks in the second wave of the Great Migration, and 350,000 whites, many of them from the South. Some European immigrants and their descendants feared black competition for jobs and housing. The federal government prohibited discrimination in defense work but when in June 1943, Packard promoted three blacks to work next to whites on its assembly lines, 25,000 whites walked off the job. The Detroit race riot of 1943 took place three weeks after the Packard plant protest. Over the course of three days, 34 people were killed, of whom 25 were African American, and approximately 600 were injured, 75% black people.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): After which event did the 1943 race riot happen?
Ah, so..
Packard plant protest