QUES: One of the Han's greatest mathematical advancements was the world's first use of negative numbers. Negative numbers first appeared in the Nine Chapters on the Mathematical Art as black counting rods, where positive numbers were represented by red counting rods. Negative numbers are used in the Bakhshali manuscript of ancient India, but its exact date of compilation is unknown. Negative numbers were also used by the Greek mathematician Diophantus in about 275 AD, but were not widely accepted in Europe until the 16th century AD.
What were positive numbers portayed as in the treatise of the Nine Chapters on the Mathematical Art?

ANS: red counting rods

QUES: With the growing possibility of an Allied invasion in the Balkans, the Axis began to divert more resources to the destruction of the Partisans main force and its high command. This meant, among other things, a concerted German effort to capture Josip Broz Tito personally. On 25 May 1944, he managed to evade the Germans after the Raid on Drvar (Operation Rosselsprung), an airborne assault outside his Drvar headquarters in Bosnia.
Who diverted resources to the destruction of the Partisans?

ANS: Axis

QUES: Since the mid-1980s, Spielberg has increased his role as a film producer. He headed up the production team for several cartoons, including the Warner Bros. hits Tiny Toon Adventures, Animaniacs, Pinky and the Brain, Toonsylvania, and Freakazoid!, for which he collaborated with Jean MacCurdy and Tom Ruegger. Due to his work on these series, in the official titles, most of them say, "Steven Spielberg presents" as well as making numerous cameos on the shows. Spielberg also produced the Don Bluth animated features, An American Tail and The Land Before Time, which were released by Universal Studios. He also served as one of the executive producers of Who Framed Roger Rabbit and its three related shorts (Tummy Trouble, Roller Coaster Rabbit, Trail Mix-Up), which were all released by Disney, under both the Walt Disney Pictures and the Touchstone Pictures banners. He was furthermore, for a short time, the executive producer of the long-running medical drama ER. In 1989, he brought the concept of The Dig to LucasArts. He contributed to the project from that time until 1995 when the game was released. He also collaborated with software publishers Knowledge Adventure on the multimedia game Steven Spielberg's Director's Chair, which was released in 1996. Spielberg appears, as himself, in the game to direct the player. The Spielberg name provided branding for a Lego Moviemaker kit, the proceeds of which went to the Starbright Foundation.
In what year was the Starbright Foundation launched?

ANS: unanswerable

QUES: In 1854 president Antonio Lopez de Santa Anna enlarged the area of the Federal District almost eightfold from the original 220 to 1,700 km2 (80 to 660 sq mi), annexing the rural and mountainous areas to secure the strategic mountain passes to the south and southwest to protect the city in event of a foreign invasion. (The MexicanAmerican War had just been fought.) The last changes to the limits of the Federal District were made between 1898 and 1902, reducing the area to the current 1,479 km2 (571 sq mi) by adjusting the southern border with the state of Morelos. By that time, the total number of municipalities within the Federal District was twenty-two.
What is the current area of Mexico City?

ANS:
1,479 km2 (571 sq mi)