A cicada is an insect with a stout body, a wide, blunt head, protruding eyes, and two pairs of membranous wings. Male cicadas have platelike membranes on the thorax, which they vibrate like drum heads, producing a loud, shrill sound. The Magicicada species have the longest known life cycles of any insect–17 years. They live only one week as winged adults, however, spending the rest of the time in the form of larvae, burrowed underground. To what are their long life cycles an adaptation? Discuss
Source: The Free Dictionary
The contact lens, a thin plastic lens worn between the eye and eyelid, usually serves the same general corrective purpose as conventional glasses, but may be worn for cosmetic or therapeutic purposes as well. Leonardo da Vinci is frequently credited with having introduced the general principle of contact lenses, but it was A.E. Fick, a Swiss physician, who made the first, albeit uncomfortable, contact lens in 1887. According to estimates, how many people use contact lenses worldwide? 
Montefiore was a famous 19th century British-Jewish philanthropist. He was connected through marriage to the famed Rothschild family and became affiliated with the family’s banking business. After accumulating a fortune on the London stock exchange, he retired at age 40 to devote himself to philanthropy and to securing political and civil emancipation for Jews in England, founding a hospital and girls’ school in Jerusalem in 1855. Montefiore was knighted by what queen? 
Our Lady of Fatima is the title given to the Virgin Mary by those who believe that she appeared to three shepherd children at Fátima, Portugal, in 1917, at a time when many young men, including relatives of the children, were fighting in WWI. She reportedly exhorted the children to do penance, and they wore tight cords around their waists and abstained from water on hot days. She also reportedly confided to them three secrets. One of these was a vision of Hell. What were the others? 
The Philly Cheesesteak is a sandwich of steak, cheese, and onions that is considered to be a city icon. Responsibility for its invention is claimed by Philadelphia’s Olivieri brothers, who began selling it at their hot dog stand near south Philadelphia’s Italian Market in the 1930s. Today, a number of long-running rival establishments each claim loyal followings, and Philadelphians enthusiastically debate the merits of each shop’s recipe. What types of cheese are commonly used on cheesesteaks? 
Model railroading (US) or Railway modeling (UK) is a hobby in which rail transport systems are modeled at a reduced scale. The models include the rail vehicles and the entire infrastructure of railroads as well as the surrounding scenery, called a “layout.” Today, model railway engines are generally operated by low-voltage electricity supplied through the tracks; how were early models made before the advent of practical electricity? 
Flea markets are gatherings of buyers and vendors in open-market layouts. The vast majority of flea markets in rural areas sell goods that are secondhand, while newer but usually inexpensive items can be found at larger urban markets. The original flea market is likely the extant Marché aux puces in the northern suburbs of Paris, named after the flea-infested clothing and rags originally sold there in the 17th cent. What is a car boot sale? 
Wyeth is an American painter whose work has been enormously popular and critically acclaimed since his first one-man show in 1937. His principal subjects are the people of Chadds Ford, Pennsylvania, and Cushing, Maine, portrayed in a meticulous naturalistic style. The best-known of Wyeth’s paintings, Christina’s World (1948), hangs at the Museum of Modern Art in New York City. What are his “Helga” pictures, and why did they generate a considerable amount of media buzz? 
Wallpaper was used in Europe in the 16th and 17th century as an inexpensive substitute for costly hangings. Outlines were block-printed, and the color was filled in with brush or stencil. The flock technique of printing designs with an adhesive and sprinkling with fine bits of wool or silk was probably first adapted to wallpaper around 1620 in France, but, by the 18th century, England had become principal wallpaper manufacturer. When did the wallpaper craze reach the American colonies? 
Sculpting ice presents a number of difficulties stemming from the material’s variability with regard to purity and air content, as well as its tendency to melt. Ice sculptures feature decoratively in some cuisines, especially in Asia, and numerous competitions are held annually around the world where competitors sculpt realistic as well as abstract forms. In Kiruna, Sweden, a hotel made entirely of ice blocks is open from November to May. Where can you visit an ice hotel in North America?