In a lucid dream, the dreamer is aware that he or she is dreaming while the dream is in progress. During lucid dreams, it is often possible to exert conscious control over characters and environments, as well as to perform otherwise physically impossible feats. Children tend to enter such dream states more easily than adults, but there are techniques one can learn to intentionally induce a lucid dream. Lucid dreaming is sometimes suggested as a remedy for what disorder? Discuss
Source: The Free Dictionary
The US Federal Reserve was created in response to the Bank Panic of 1907, a financial crisis in the US during which the stock market crashed and the economy entered a recession. “The Fed” is a central banking system and note-issuing authority that regulates the country’s credit and monetary policy. It is comprised of 12 regional Federal Reserve Banks located throughout the US, various member banks, and a supervisory Federal Reserve Board. What are some criticisms of the Federal Reserve System? 
The gallbladder is a small sac that stores and concentrates bile, a bitter fluid that aids in the emulsification of fats. In some people, small, pebble-like masses composed chiefly of cholesterol, calcium salts, and bile pigments form in the gallbladder or bile ducts. The presence of gallstones can lead to painful obstruction or infection and is sometimes treated with cholecystectomy, the surgical removal of the gallbladder. How does a procedure called lithotripsy break up gallstones? 
Grapeshot is a cluster of small iron balls loaded into a canvas bag and fired from a cannon. When a grapeshot-loaded cannon is fired, the balls disperse at a high velocity, causing devastation similar to that of a scaled-up shotgun. This ammunition was especially effective against infantry massed at close range and was used until the early 19th century, when it was largely replaced by metal-cased canister shot. Which pirate was killed by a blast of grapeshot? 
Rhyta are ancient, hornlike drinking vessels that often feature a wide mouth and a pierced, pointed bottom. This design allows a rhyton to function as both a scoop for liquids contained in a larger storage vessel and, when the hole at its base is unstoppered, as a pouring device. Rhyta are often shaped like animal heads or horns and can be simple ceramic constructions or ornate showpieces decorated with precious metals and stones. What animal was frequently depicted on the rhyta of Minoan Crete? 
Smokejumpers are firefighters who parachute into remote areas to combat forest fires. While smokejumpers save many lives, the inherent risks associated with parachuting into a fire lead many to question the value of the profession. Proponents argue that parachute deployment helps firefighters reach remote areas quickly and with more equipment than other means allow, thus enabling them to begin containing fires at their early stages. Which country employs the largest number of smokejumpers? 
Wingsuit fliers wear a specialized jumpsuit that shapes the human body into an airfoil, a structure whose shape provides lift, propulsion, stability, and directional control over a flying object. Fabric sewn between the legs and under the arms of the wingsuit allows the flier to glide through the air much like a bird, while a separate parachute allows him to land safely. A British stuntman died wing-diving in 2013, just a year after he parachuted into what high-profile event? 
Despite being the last digit to come into use in the numerical system, the zero plays a central role in mathematics. During the 2nd century CE, Ptolemy began using a small circle with a long bar above it to symbolize zero. Because it was used alone, not just as a placeholder, this Hellenistic zero was perhaps the first documented use of a number zero in the Old World. Four centuries later, an Indian mathematician wrote a book of rules governing the use of the zero. Is zero an odd or even number? 
Sambo is a modern martial art and combat sport that was developed to enhance the military’s hand-to-hand combat system in the former Soviet Union. In 1938, it was named the official sport of the USSR. Sambo combines a variety of wrestling styles with east Asian martial arts, boxing, and even fencing, from which it derives its parrying and lunging techniques. What does the combat style’s name mean? 
Buzkashi is a traditional Central Asian team sport in which players on horseback try to grab the carcass of a headless goat or calf and pitch it across a goal line or into a target circle or vat. Although it is known as a popular Afghani sport, Buzkashi began as a sport of the steppes, a vast, prairie-like ecoregion of Eurasia, and remains a popular game throughout the region. Games can last for several days, and competition is fierce. How is the animal carcass prepared before a game?