Problem: Switzerland:

In about 260 AD, the fall of the Agri Decumates territory north of the Rhine transformed today's Switzerland into a frontier land of the Empire. Repeated raids by the Alamanni tribes provoked the ruin of the Roman towns and economy, forcing the population to find shelter near Roman fortresses, like the Castrum Rauracense near Augusta Raurica. The Empire built another line of defense at the north border (the so-called Donau-Iller-Rhine-Limes), but at the end of the fourth century the increased Germanic pressure forced the Romans to abandon the linear defence concept, and the Swiss plateau was finally open to the settlement of German tribes.

What was the name of the concept used by the Roman Empire when building another line of defense at the north border?
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A: the linear defence concept

Problem: On January 7, 2012, Beyonce gave birth to a daughter, Blue Ivy Carter, at Lenox Hill Hospital in New York under heavy security. Two days later, Jay Z released "Glory", a song dedicated to their child, on his website Lifeandtimes.com. The song detailed the couple's pregnancy struggles, including a miscarriage Beyonce suffered before becoming pregnant with Blue Ivy. Blue Ivy's cries are included at the end of the song, and she was officially credited as "B.I.C." on it. At two days old, she became the youngest person ever to appear on a Billboard chart when "Glory" debuted on the Hot R&B/Hip-Hop Songs chart.
At what hospital was the baby delivered?
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Answer: Lenox Hill Hospital

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Puppetry and shadow plays were also a favoured form of entertainment in past centuries, a famous one being Wayang from Indonesia. The arts and literature in some of Southeast Asia is quite influenced by Hinduism, which was brought to them centuries ago. Indonesia, despite conversion to Islam which opposes certain forms of art, has retained many forms of Hindu-influenced practices, culture, art and literature. An example is the Wayang Kulit (Shadow Puppet) and literature like the Ramayana. The wayang kulit show has been recognized by UNESCO on November 7, 2003, as a Masterpiece of Oral and Intangible Heritage of Humanity.
Which country despite converting to Islam has retained many forms of Hindu practices, culture, art & literature?
A: Indonesia

Context and question: In the far north, there is a division between Berber-descendent Tuareg nomad populations and the darker-skinned Bella or Tamasheq people, due the historical spread of slavery in the region. An estimated 800,000 people in Mali are descended from slaves. Slavery in Mali has persisted for centuries. The Arabic population kept slaves well into the 20th century, until slavery was suppressed by French authorities around the mid-20th century. There still persist certain hereditary servitude relationships, and according to some estimates, even today approximately 200,000 Malians are still enslaved.
Roughly how many Malians are descendants of slaves?
Answer: 800,000

Question: Yet another influential philosopher who had an influence on modern philosophy was Ibn Tufail. His philosophical novel, Hayy ibn Yaqdha, translated into Latin as Philosophus Autodidactus in 1671, developed the themes of empiricism, tabula rasa, nature versus nurture, condition of possibility, materialism, and Molyneux's problem. European scholars and writers influenced by this novel include John Locke, Gottfried Leibniz, Melchisedech Thevenot, John Wallis, Christiaan Huygens, George Keith, Robert Barclay, the Quakers, and Samuel Hartlib.
Is there an answer to this question: What European scholars influenced Tufail?

Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
One of the problems of the standard electric light bulb is filament notching due to evaporation of the filament. Small variations in resistivity along the filament cause "hot spots" to form at points of higher resistivity; a variation of diameter of only 1% will cause a 25% reduction in service life. These hot spots evaporate faster than the rest of the filament, which increases the resistance at that pointthis creates a positive feedback that ends in the familiar tiny gap in an otherwise healthy-looking filament. Irving Langmuir found that an inert gas, instead of vacuum, would retard evaporation. General service incandescent light bulbs over about 25 watts in rating are now filled with a mixture of mostly argon and some nitrogen, or sometimes krypton. Lamps operated on direct current develop random stairstep irregularities on the filament surface which may cut lifespan in half compared to AC operation; different alloys of tungsten and rhenium can be used to counteract the effect.
Which gases are typically used in a light bulb?
A:
argon and some nitrogen, or sometimes krypton