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At the time it was common for aquarium hobbyists in Germany to create home "mini-reefs". Commercial coral propagation began in America in the 1960s, and hobby industry took off in the early 1980s. The trend was attributed to hobby magazines. [8] In 2009 the US government awarded $3.3 million for a project to cultivate 5,000 colonies of Acropora ...
To the horror of dry-fly purists, Skues later wrote two books, Minor Tactics of the Chalk Stream, and The Way of a Trout with a Fly, which greatly influenced the development of wet fly fishing. In northern England and Scotland, many anglers also favored wet-fly fishing, where the technique was more popular and widely practiced than in southern ...
The Great Fish Market, painted by Jan Brueghel the Elder. Fishing is a prehistoric practice dating back at least 70,000 years. Since the 16th century, fishing vessels have been able to cross oceans in pursuit of fish, and since the 19th century it has been possible to use larger vessels and in some cases process the fish on board.
Sneaker collecting is the acquisition and trading of sneakers as a hobby. It is often manifested by the use and collection of shoes made for particular sports, particularly basketball and skateboarding. A person involved in sneaker collecting is sometimes called a sneakerhead. [1]
Sedentary behavior enables less energy expenditure than active behavior. Sedentary behavior is not the same as physical inactivity: sedentary behavior is defined as "any waking behavior characterized by an energy expenditure less than or equal to 1.5 metabolic equivalents (METs), while in a sitting, reclining or lying posture".
Although digitization seems to be a promising area for future preservation, there are also problems. The main problems are that digital space costs money, media and file formats may become obsolete, and backwards compatibility is not guaranteed. [5] Higher-quality images take a longer time to scan, but are often more valuable for future use.
In contrast, the region with the lowest prevalence of physical inactivity is Southeast Asia. There, 19% of women and 15% of men are physically inactive. [2] In the US, physical inactivity prevalence varies by state and ethnicity. All states and territories had prevalence rates of more than 15% of adults.
This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory.