The organs of smell are confined to a small area in the roof of the nasal cavity. Olfactory cells are stimulated when certain molecules reach them, and nerve fibers extend from these receptor cells to the olfactory bulb in the human brain. Smell is one of our most subtle senses, amplifying the sense of taste and detecting tens of thousands of distinct scents. Odor information is easily stored in long-term memory and has strong connections to emotional memory. Why might this be? Discuss
Source: The Free Dictionary
Evidence of human cannibalism suggests that the practice began thousands of years ago. Cannibalism, eating the flesh of the members of one’s own species, is practiced ritually in some cultures, though in Western society people tend to turn to cannibalism only in situations of extreme starvation or when they are mentally ill. Historically, the Aztec Empire is the most famous example of a cannibalistic society. What country was once known as the “Cannibal Isles”? 
Camels, ruminant mammals of the family Camelidae, are well adapted to desert life, as they can live for several days without drinking and their broad, flat, two-toed feet do not sink in the sand. There are two species of true camel, the single-humped Arabian camel, a domesticated animal used in Arabia and N Africa, and the two-humped Bactrian camel of central Asia. The humps, fat stores that provide energy and water when metabolized, also aid in desert survival. How fast can a camel run? 
The term rocket-propelled grenade is actually a misnomer stemming from the Russian acronym for a handheld anti-tank grenade-launcher. The RPG, developed by the Soviets during WWII, is a low-cost, low-tech, direct fire, portable weapon used primarily against unarmored or medium-armored vehicles and personnel. Though it is largely ineffective against heavily armored vehicles and has a low level of accuracy, the RPG has become a favored weapon in what modern conflicts? 
In the 3rd century BCE, Hippocrates introduced his theory of Humoralism. It was based on the notion that 4 fluids, each corresponding to one of the 4 elements, permeate the human body and cause disease when not in balance. Theories regarding the 4 humors—blood, black bile, yellow bile, and phlegm—expanded over the years, and in the 2nd century CE, Galen published a treatise which associated a specific temperament with each humor. What humor was thought to cause a melancholic disposition? 
A satellite radio is a digital radio that receives signals broadcast by communications satellites. Since satellite radio operates wherever there is line of sight between the antenna and satellite, the signal spans a much wider geographical range than terrestrial radio. Satellite radio service is subscription-based and can only be accessed through specialized receivers. How many satellites are generally needed to provide service to an entire continent? 
The Magyars, a nomadic people, migrated from the Urals to the Northern Caucasus region around 460 CE. They remained there for roughly 400 years, until the advance of the Pechenegs forced them west into what is now Romania. They arrived in Hungary towards the end of the 9th century, displacing the resident Huns and Slavs. The Magyars currently comprise 92% of the Hungarian population; consequently, the words Magyar and Hungarian are used interchangeably. What is the origin of the latter term? 
Hieratic, first used around 3,000 BCE, was the basic writing system of the ancient Egyptian pharaonic period and provided a simpler alternative to the contemporaneous hieroglyphic system. It was generally written with ink on papyrus and was often used to compose administrative documents and letters, as well as legal, literary, and religious texts. Much of what is now known about the lives of common Egyptians has been deciphered from such texts. What writing system is descended from hieratic? 
Dog Whisperer is a National Geographic Channel reality TV series in which Cesar Millan, a self-proclaimed dog behaviorist, rehabilitates unruly dogs and teaches their owners proper canine training techniques. Though he has no formal certification, Millan believes his early observations of his family’s farm dogs give him unique insight into pack mentality. In 2006, Millan published Cesar’s Way, a guide to dog psychology. What are the three principles of Millan’s training philosophy? 
In 2002, Gabon’s president established a national park system that protects about 11% of the country’s land and waters. Included is Mayumba National Park, located on the Atlantic coast of central Africa and dedicated to the protection of marine life. The park shelters a 60 km (37 mi.) strip of beach and coastal vegetation and extends another 15 km (9 mi.) out to sea. Dolphins and whales can often be found in the waters off the coast. What reptile uses the park’s beach as its breeding ground?