The rhythm is linked to the lightdark cycle. Animals, including humans, kept in total darkness for extended periods eventually function with a free-running rhythm. Their sleep cycle is pushed back or forward each "day", depending on whether their "day", their endogenous period, is shorter or longer than 24 hours. The environmental cues that reset the rhythms each day are called zeitgebers (from the German, "time-givers"). Totally blind subterranean mammals (e.g., blind mole rat Spalax sp.) are able to maintain their endogenous clocks in the apparent absence of external stimuli. Although they lack image-forming eyes, their photoreceptors (which detect light) are still functional; they do surface periodically as well.[page needed]
What conditions will produce a free-running rhythm in humans?
total darkness

Input: Richmond, Virginia
Between 1963 and 1965, there was a "downtown boom" that led to the construction of more than 700 buildings in the city. In 1968, Virginia Commonwealth University was created by the merger of the Medical College of Virginia with the Richmond Professional Institute. In 1970, Richmond's borders expanded by an additional 27 square miles (70 km2) on the south. After several years of court cases in which Chesterfield County fought annexation, more than 47,000 people who once were Chesterfield County residents found themselves within the city's perimeters on January 1, 1970. In 1996, still-sore tensions arose amid controversy involved in placing a statue of African American Richmond native and tennis star Arthur Ashe to the famed series of statues of Confederate heroes of the Civil War on Monument Avenue. After several months of controversy, the bronze statue of Ashe was finally completed on Monument Avenue facing the opposite direction from the Confederate Heroes on July 10, 1996.

About how many structures were built in Richmond during the downtown boom?
Output: 700

Input: Article: Photo CD is a system designed by Kodak for digitizing and storing photos on a CD. Launched in 1992, the discs were designed to hold nearly 100 high-quality images, scanned prints and slides using special proprietary encoding. Photo CDs are defined in the Beige Book and conform to the CD-ROM XA and CD-i Bridge specifications as well. They are intended to play on CD-i players, Photo CD players and any computer with the suitable software irrespective of the operating system. The images can also be printed out on photographic paper with a special Kodak machine. This format is not to be confused with Kodak Picture CD, which is a consumer product in CD-ROM format.

Now answer this question: When were Photo CDs initially released?

Output: 1992

Article: In comparison, the 2010 Census Redistricting Data indicated that the racial makeup of the city was 661,839 (43.4%) African American, 626,221 (41.0%) White, 6,996 (0.5%) Native American, 96,405 (6.3%) Asian (2.0% Chinese, 1.2% Indian, 0.9% Vietnamese, 0.6% Cambodian, 0.4% Korean, 0.3% Filipino, 0.2% Pakistani, 0.1% Indonesian), 744 (0.0%) Pacific Islander, 90,731 (5.9%) from other races, and 43,070 (2.8%) from two or more races. Hispanic or Latino of any race were 187,611 persons (12.3%); 8.0% of Philadelphia is Puerto Rican, 1.0% Dominican, 1.0% Mexican, 0.3% Cuban, and 0.3% Colombian. The racial breakdown of Philadelphia's Hispanic/Latino population was 63,636 (33.9%) White, 17,552 (9.4%) African American, 3,498 (1.9%) Native American, 884 (0.47%) Asian, 287 (0.15%) Pacific Islander, 86,626 (46.2%) from other races, and 15,128 (8.1%) from two or more races. The five largest European ancestries reported in the 2010 United States Census Census included Irish (12.5%), Italian (8.4%), German (8.1%), Polish (3.6%), and English (3.0%).

Question: What is the hispanic make-up of the population?
Ans: 12.3%

Here is a question about this article: In 2013, an article in Mother Jones stated that while "[m]any prestigious orchestras have significant female membershipwomen outnumber men in the New York Philharmonic's violin sectionand several renowned ensembles, including the National Symphony Orchestra, the Detroit Symphony, and the Minnesota Symphony, are led by women violinists", the double bass, brass, and percussion sections of major orchestras "...are still predominantly male." A 2014 BBC article stated that the "...introduction of 'blind' auditions, where a prospective instrumentalist performs behind a screen so that the judging panel can exercise no gender or racial prejudice, has seen the gender balance of traditionally male-dominated symphony orchestras gradually shift."
What is the answer to this question: The National Symphony Orchestra is led by what gender of violinist?
****
So... female

Article: Copper compounds in liquid form are used as a wood preservative, particularly in treating original portion of structures during restoration of damage due to dry rot. Together with zinc, copper wires may be placed over non-conductive roofing materials to discourage the growth of moss.[citation needed] Textile fibers use copper to create antimicrobial protective fabrics, as do ceramic glazes, stained glass and musical instruments. Electroplating commonly uses copper as a base for other metals such as nickel.

Question: What function does copper serve when used in textile fibers?
Ans:
antimicrobial protective fabrics