The Northern and Southern dynasties () was a period in the history of China that lasted from 420 to 589, following the tumultuous era of the Sixteen Kingdoms and the Wu Hu states.
 It is sometimes considered as the latter part of a longer period known as the Six Dynasties (220 to 589).
 Though an age of civil war and political chaos, it was also a time of flourishing arts and culture, advancement in technology, and the spread of Mahayana Buddhism and Daoism.
 The period saw large-scale migration of Han Chinese to the lands south of the Yangtze.
 The period came to an end with the unification of all of China proper by Emperor Wen of the Sui Dynasty.
Delsym is a brand of cough medicine owned by Reckitt Benckiser, and manufactured at Unither Manufacturing in Rochester, NY.
 It is different from most brands of cough medicine in that the active ingredient is "time released".
 The time release feature allows the drug to suppress the cough reflex for a longer period of time.
 The active ingredient per teaspoon (5 mL) is dextromethorphan polistirex, equivalent to dextromethorphan HBr 30 mg.
Parabelle ('para' meaning 'to resemble; 'belle' meaning 'beauty' in French) is a Canadian rock band that initially formed in 2007 as a side project by Kevin Matisyn, the former lead singer of Evans Blue, and Kenneth Nixon of Framing Hanley.
 Following Kevin Matisyn's departure from Evans Blue in 2008, Parabelle was formed into a full band and has undergone numerous line-up changes since then.
 The band's first release was a double album entitled "A Summit Borderline/A Drop Oceanic" on July 6, 2009.
 With the subsequent addition of Kyle Mathis (formerly of Neverset) and Aaron Burton, they released their second album "Reassembling the Icons" on November 15, 2010.
 An acoustic album, "These Electric Pages Have Been Unplugged", featuring studio acoustic tracks, was released on May 24, 2011.
 The band released a third studio album,"Your Starry Eyes Will Never Make Us Even", on August 21, 2012.
Evans Blue is a Canadian rock band from Toronto, Ontario, Canada founded in 2005.
 Altogether, they have sold over 1 million albums worldwide, including four studio albums and one live album.
Spaced retrieval, also known as expanded retrieval or uniform retrieval, is a learning technique, which requires users to rehearse information to be learned at different and increasing spaced intervals of time or a set uniform amount of time.
 In testing this type of learning, people are instructed to rehearse a given set of information at a certain time, and each new rehearsal is expected to have a longer period of time between itself and the previous rehearsal or an equal amount of time between rehearsals.
 At the end of every trial period there is a test phase.
 Landauer and Bjork first studied this technique of learning in 1978.
 The study required participants to learn names from flash cards.
 Prior to learning participants were placed into five different rehearsal types: uniform short, uniform moderate, uniform long, expanding, and contracting.
 These all indicate the amount and spacing of trials between each test.
 Uniform trials involve a number of trials between each test stage, but the trial numbers are fixed (e.g. 2-test-2-test-2-test).
 Contracting rehearsals involve larger intervals of time between the first few trials and the test phase, but eventually the trials decrease in number.
 Expanding involves starting with trials and tests close together, and as they progress the person would have more time between each trial and test (e.g. 1-test-2-test-3-test).
 The effectiveness of the rehearsal types was measured by seeing how accurately participants responded during a test phase.
 Expanding was proven to be the most important because it produced the highest amount of recall during the test period.
Distributed practice (also known as spaced repetition or spaced practice) is a learning strategy, where practice is broken up into a number of short sessions – over a longer period of time.
 Humans and animals learn items in a list more effectively when they are studied in several sessions spread out over a long period of time, rather than studied repeatedly in a short period of time, a phenomenon called the spacing effect.
 The opposite, massed practice, consists of fewer, longer training sessions.
 It is generally a less effective method of learning.
 For example, when studying for an exam dispersing your studying more frequently over a larger period of time will result in more effective learning than intense study the night before.
Quix*o*tic was a rock band active from 1997 to 2002 in the area of Washington, D.C., United States.
 They were known for their blend of R&B and doo wop with a Gothic outlook.
In the statistics of time series, and in particular the analysis of financial time series for stock trading purposes, a moving-average crossover occurs when, on plotting two moving averages each based on different degrees of smoothing, the traces of these moving averages cross.
 It does not predict future direction but shows trends.
 This indicator uses two (or more) moving averages, a slower moving average and a faster moving average.
 The faster moving average is a short term moving average.
 For end-of-day stock markets, for example, it may be 5-, 10- or 25-day period while the slower moving average is medium or long term moving average (e.g. 50-, 100- or 200-day period).
 A short term moving average is faster because it only considers prices over short period of time and is thus more reactive to daily price changes.
 On the other hand, a long term moving average is deemed slower as it encapsulates prices over a longer period and is more lethargic.
 However, it tends to smooth out price noises which are often reflected in short term moving averages.
"Cold (But I'm Still Here)" is the first single off Evans Blue's debut album, "The Melody and the Energetic Nature of Volume".
 The song was released December 13, 2005, two months prior to the album release, and garnered frequent radio play in anticipation of the upcoming album.
 Evans Blue's official MySpace explains the meaning of this song as well as others by the group.
 A music video was also produced for "Cold (But I'm Still Here)."
 The song currently has over three million plays on MySpace.
Evans Blue is the third studio album by Canadian rock band Evans Blue.
 It is the first to feature new singer Dan Chandler and the last to feature drummer Howard Davis.

Question: To date, which band between Evans Blue and Quix*o*tic, has been active for a longer period of time?
Answer: Evans Blue