Problem: Light-emitting diode:

LEDs have been developed by Seoul Semiconductor that can operate on AC power without the need for a DC converter. For each half-cycle, part of the LED emits light and part is dark, and this is reversed during the next half-cycle. The efficacy of this type of HP-LED is typically 40 lm/W. A large number of LED elements in series may be able to operate directly from line voltage. In 2009, Seoul Semiconductor released a high DC voltage LED, named as 'Acrich MJT', capable of being driven from AC power with a simple controlling circuit. The low-power dissipation of these LEDs affords them more flexibility than the original AC LED design.

What is so good about ac powered HP-LEDs?
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A: more flexibility


Problem: The area now known as Tennessee was first inhabited by Paleo-Indians nearly 12,000 years ago. The names of the cultural groups that inhabited the area between first settlement and the time of European contact are unknown, but several distinct cultural phases have been named by archaeologists, including Archaic (8000–1000 BC), Woodland (1000 BC–1000 AD), and Mississippian (1000–1600 AD), whose chiefdoms were the cultural predecessors of the Muscogee people who inhabited the Tennessee River Valley before Cherokee migration into the river's headwaters.
What time period corresponds with the Mississippian cultural phase in early Tennessee history?
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Answer: 1000–1600 AD


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
There are many art galleries in Utrecht. There are also several foundations to support art and artists. Training of artists is done at the Utrecht School of the Arts. The Centraal Museum has many exhibitions on the arts, including a permanent exhibition on the works of Utrecht resident illustrator Dick Bruna, who is best known for creating Miffy ("Nijntje", in Dutch). Although street art is illegal in Utrecht, the Utrechtse Kabouter, a picture of a gnome with a red hat, became a common sight in 2004. Utrecht also houses one of the landmarks of modern architecture, the 1924 Rietveld Schröder House, which is listed on UNESCO's world heritage sites.
What illistrator is famouse for creating a gnome with a red hat?
A: unanswerable


Context and question: Napoleon was born on 15 August 1769, to Carlo Maria di Buonaparte and Maria Letizia Ramolino, in his family's ancestral home Casa Buonaparte in Ajaccio, the capital of the island of Corsica. He was their fourth child and third son. This was a year after the island was transferred to France by the Republic of Genoa. He was christened Napoleone di Buonaparte, probably named after an uncle (an older brother who did not survive infancy was the first of the sons to be called Napoleone). In his 20s, he adopted the more French-sounding Napoléon Bonaparte.[note 2]
What was the name of Napoleon's family home?
Answer: Casa Buonaparte


Question: Madonna's initial music videos reflected her American and Hispanic mixed street style combined with a flamboyant glamor. She was able to transmit her avant-garde downtown New York fashion sense to the American audience. The imagery and incorporation of Hispanic culture and Catholic symbolism continued with the music videos from the True Blue era. Author Douglas Kellner noted, "such 'multiculturalism' and her culturally transgressive moves turned out to be highly successful moves that endeared her to large and varied youth audiences." Madonna's Spanish look in the videos became the fashion trend of that time, in the form of boleros and layered skirts, accessorizing with rosary beads and a crucifix as in the video of "La Isla Bonita".
Is there an answer to this question: What type of Spanish clothings were worn for the video La Ista Bonita?

Answer: boleros and layered skirts


The radiation of many antennas shows a pattern of maxima or "lobes" at various angles, separated by "nulls", angles where the radiation falls to zero. This is because the radio waves emitted by different parts of the antenna typically interfere, causing maxima at angles where the radio waves arrive at distant points in phase, and zero radiation at other angles where the radio waves arrive out of phase. In a directional antenna designed to project radio waves in a particular direction, the lobe in that direction is designed larger than the others and is called the "main lobe". The other lobes usually represent unwanted radiation and are called "sidelobes". The axis through the main lobe is called the "principal axis" or "boresight axis".
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is the main distinction of side lobes?
Ah, so..
represent unwanted radiation