Article: Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for healthy growth in rabbits has been reported to be at least 3 ppm in the diet. However, higher concentrations of copper (100 ppm, 200 ppm, or 500 ppm) in the diet of rabbits may favorably influence feed conversion efficiency, growth rates, and carcass dressing percentages.

Question: What is the minimum amount of copper rabbits should have in their diet?
Ans: 3 ppm


Here is a question about this article: Cartooning is most frequently used in making comics, traditionally using ink (especially India ink) with dip pens or ink brushes; mixed media and digital technology have become common. Cartooning techniques such as motion lines and abstract symbols are often employed.
What is the answer to this question: What type of ink is often used in making comics?
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So... India ink


The problem: Answer a question about this article:
Beyoncé participated in George Clooney and Wyclef Jean's Hope for Haiti Now: A Global Benefit for Earthquake Relief telethon and was named the official face of the limited edition CFDA "Fashion For Haiti" T-shirt, made by Theory which raised a total of $1 million. On March 5, 2010, Beyoncé and her mother Tina opened the Beyoncé Cosmetology Center at the Brooklyn Phoenix House, offering a seven-month cosmetology training course for men and women. In April 2011, Beyoncé joined forces with US First Lady Michelle Obama and the National Association of Broadcasters Education Foundation, to help boost the latter's campaign against child obesity by reworking her single "Get Me Bodied". Following the death of Osama bin Laden, Beyoncé released her cover of the Lee Greenwood song "God Bless the USA", as a charity single to help raise funds for the New York Police and Fire Widows' and Children's Benefit Fund.
Beyonce opened a cosmetology center in what location?
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The answer: Brooklyn Phoenix House


Problem: Please answer a question about the following article about Nanjing:
A monument to the huge human cost of some of the gigantic construction projects of the early Ming dynasty is the Yangshan Quarry (located some 15–20 km (9–12 mi) east of the walled city and Ming Xiaoling mausoleum), where a gigantic stele, cut on the orders of the Yongle Emperor, lies abandoned, just as it was left 600 years ago when it was understood it was impossible to move or complete it.
Why was the stele abandoned?
A: it was impossible to move or complete it


Question: Read this and answer the question

The Han-era Chinese used bronze and iron to make a range of weapons, culinary tools, carpenters' tools and domestic wares. A significant product of these improved iron-smelting techniques was the manufacture of new agricultural tools. The three-legged iron seed drill, invented by the 2nd century BC, enabled farmers to carefully plant crops in rows instead of casting seeds out by hand. The heavy moldboard iron plow, also invented during the Han dynasty, required only one man to control it, two oxen to pull it. It had three plowshares, a seed box for the drills, a tool which turned down the soil and could sow roughly 45,730 m2 (11.3 acres) of land in a single day.

How many acres of land could succesfully be sowed with a seed box in a day?
Answer: 11.3 acres


In Japan, 14 August is considered to be the day that the Pacific War ended. However, as Imperial Japan actually surrendered on 15 August, this day became known in the English-speaking countries as "V-J Day" (Victory in Japan). The formal Japanese Instrument of Surrender was signed on 2 September 1945, on the battleship USS Missouri, in Tokyo Bay. The surrender was accepted by General Douglas MacArthur as Supreme Commander for the Allied Powers, with representatives of several Allied nations, from a Japanese delegation led by Mamoru Shigemitsu and Yoshijiro Umezu.
What day is know in the United States as "V-J Day"?
15 August