A coral reef is a ridge of living coral, coral skeletons, and calcium carbonate deposits from organisms such as calcareous algae, mollusks, and protozoans. The resulting structure provides a critical habitat for a wide variety of fish and marine invertebrates. Coral reefs also protect shores against erosion by causing large waves to break and lose some of their force before reaching land. More than 90% of the estimated 109,800 sq mi (284,300 sq km) of reefs in the world are in what region? Discuss
Source: The Free Dictionary
The jelly bean is a type of confection that has a hardened sugar coating over a chewy center. “Turkish Delight,” a Middle Eastern candy consisting of jellylike cubes covered with powdered sugar, likely inspired the gummy interior of the jelly bean. It is generally thought that jelly beans first became popular in 1861 when Boston confectioner William Schrafft urged people to send his jelly beans to soldiers during the American Civil War. When did jelly beans become associated with Easter? 
Fireflies light up due to bioluminescence: the ability of living organisms to convert chemical energy to light energy. Bioluminescence is also exhibited by some fungi, mollusks, and worms, and bioluminescent fish are common in the ocean’s depths, likely because the light aids in species recognition in the darkness. Other animals use luminescence in courtship and mating, to divert predators, or to attract prey. Why is most marine bioluminescence in the blue and green part of the spectrum? 
Often relied upon heavily in the science fiction and action genres, special effects are techniques used in film and television to portray scenes that cannot be achieved by normal means, such as space travel. Common examples are the use of rear-screen projections, in which previously photographed material is projected behind the actors; the filming of miniature objects in such a way as to make them look larger; and the use of animation. What are “live” special effects? 
The Salic law was the rule of succession in some royal and noble European families that forbid females to succeed to certain titles or offices in the family. It likely came from the Salian Franks, who prohibited women from succeeding to the throne. The rule was most prominently enforced by the house of Valois and the succeeding house of Bourbon in France and was involved in the rivalry of Stephen and Matilda for the English throne. What impact did it have when Victoria became queen of England? 
El Dorado—Spanish for “the gilded man”—is the fabled city of gold and jewels believed by the 16th-century Spanish and other Europeans to exist somewhere in South America. The legend supposedly originated from the Chibcha people of Colombia, who each year anointed a chieftain and rolled him in gold, which he then ceremonially washed off in a sacred lake, casting offerings of emeralds and gold into the waters. Who were some of the explorers who searched for El Dorado, and where did they look? 
A filibuster is an obstructionist tactic used in legislative assemblies. It is particularly associated with the US Senate, where the tradition of unlimited debate is strong, and it has been used by conservatives and liberals for very different purposes. It was not until 1917 that the Senate provided for cloture—or ending of the debate—by a vote of two-thirds of the Senators present. Yet, despite many attempts, cloture has been applied only rarely. What is the etymology of the term “filibuster”? 
Jauhar refers to the ancient Hindu tradition of honorable self-immolation of women. It originally described the voluntary death on a funeral pyre of India’s queens and royal women, who would kill themselves to avoid capture when their castles were defeated. Jauhar also refers to the practice of mass suicide carried out in medieval times by besieged women and children, after which men would ride out to the battlefield to face certain death. What is the most famous historical example of Jauhar? 
Depression glass is clear or colored translucent glassware that was distributed throughout the US during the Great Depression era of the 1920s and 30s. During that time, the Quaker Oats Company began putting glassware in boxes of food as an incentive to purchase, much like modern cereal box prizes. Movie theaters and businesses sometimes offered pieces simply for coming in the door. Though of marginal quality, Depression glass has become highly collectible. In what colors was it made?