The grandson of Genghis Khan, Kublai Khan was a Mongol emperor who founded China’s Yuan Dynasty and became the first Yuan emperor in 1271. In 1279, he completed his grandfather’s conquest of China by overthrowing the Sung dynasty. He promoted economic prosperity by rebuilding the Grand Canal, repairing public granaries, extending highways, and encouraging foreign commerce. His magnificent capital at Cambuluc—now Beijing—was visited by several Europeans, including what notable figure? Discuss
Source: The Free Dictionary
This violent confrontation between Chicago police and labor protesters, which dramatized the labor movement’s struggle for recognition, began when a bomb was thrown into the police ranks at a gathering of radical unionists protesting police brutality against strikers. With seven officers dead and 60 wounded, the police opened fire on the crowd. Seven anarchist leaders were later sentenced to death. Why is their trial regarded as one of the most serious miscarriages of justice in US history? 
Geocaching is an outdoor treasure-hunting game in which participants use a Global Positioning System (GPS) to hide and seek watertight containers filled with trinkets, hoards known as “geocaches” or simply “caches.” The improved accuracy of GPS devices allowed the pastime to develop, since the specific locations of the small containers could finally be logged and shared. Geocaches are now hidden in more than 100 countries and on all seven continents. What did the world’s first geocache contain? 
Located in south-central Tibet near the border of Nepal, Shishapangma is the fourteenth highest mountain in the world and the lowest of the eight-thousanders—peaks in the Himalayan and Karakoram mountain ranges that exceed a height of 8,000 m (26,247 ft). Scaled in 1964, it was the last eight-thousander to be climbed because China imposed severe travel restrictions on foreigners at the time. It is considered one of the easiest eight-thousanders to summit; nevertheless, how many have died trying? 
Before the issuance of the Penny Black—the first adhesive stamp to indicate prepayment of postage—letters were commonly paid for by their recipients. Part of an effort to reform the antiquated British postal system, the stamp featured a profile of Queen Victoria. Because its dark background made cancellation marks hard to see and made reusing stamps quite easy, it was soon redesigned. To this day, all British stamps bear a profile of the reigning monarch and are the only stamps not to list what? 
In the final days of World War II, as the Red Army of the Soviet Union was closing in on his underground bunker in Berlin, Nazi leader Adolf Hitler committed suicide by shooting himself while simultaneously biting into a cyanide capsule. Hitler’s body and that of Eva Braun—his mistress whom he had wed the day before—were then placed in a bomb crater, doused with gasoline, and set on fire by German officials. How did Soviet soldiers identify Hitler’s remains? 
Ernst Werner von Siemens demonstrated his Elektromote, the world’s first trolleybus, on a 591-yard (540-m) test track in a suburb of Berlin, Germany. The trolleybus was a converted four-wheel coach equipped with two electric motors. Electric power was transmitted to the coach via a flexible cable from a small, eight-wheeled “contact car” running on the power lines above. How long was the Elektromote in operation? 
Commonly known as Expo 67, the 1967 International and Universal Exposition drew more than 50 million visitors. Part of Canada’s centennial year celebration, Expo 67 featured 90 pavilions representing the “Man and His World” theme, including a geodesic dome designed by architect Buckminster Fuller and the Habitat 67 housing complex designed by architect Moshe Safdie, which is still occupied. Though considered the 20th century’s most successful World’s Fair, Expo 67 had a deficit of how much? 
The steamboat Sultana was a Mississippi River paddle-wheeler destroyed when one of its boilers exploded near Memphis, Tennessee. The greatest maritime disaster in US history, an estimated 1,800 of its 2,400 passengers, many of whom were Union soldiers who had just been released from Confederate prison camps, were killed when it sank. Bodies of the victims continued to be found downriver for months, yet the disaster received somewhat diminished attention since it occurred soon after what? 
Taking its name from the contraction of Geheime Staatspolizei—German for “Secret State Police”—the Gestapo was the secret police force of Nazi Germany. Created in 1933 by Hermann Goring, the Gestapo operated without civil restraints or judicial oversight, brutally suppressing partisan activities in occupied territories and arresting thousands of Jews, leftists, and other Nazi “enemies,” many of whom were sent to concentration camps. How many Gestapo members were there during World War II?