Tomb Raider is a media franchise consisting of video games, comic books, novels, theme park rides, and movies, centering around the adventures of the fictional British archaeologist Lara Croft. Since the release of the original Tomb Raider in 1996, the series developed into a lucrative franchise of related media, and Lara went on to become a major icon of the virtual gaming industry. The Guinness Book of World Records has recognised Lara Croft as the "Most Successful Human Virtual Game Heroine" in 2006. The first six games in the series were developed by Core Design, whilst Crystal Dynamics developed the latest four; their fifth game is currently in production. Two movies - Lara Croft: Tomb Raider and Lara Croft Tomb Raider: The Cradle of Life - have been produced starring American actress Angelina Jolie as Lara Croft, the first of which is still the highest-grossing film adaptation of a video game ever released in U.S., and third worldwide behind Prince of Persia: The Sands of Time and Resident Evil: Afterlife.

Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects. The temporal position of events with respect to the transitory present is continually changing; future events become present, then pass further and further into the past. Time has been a major subject of religion, philosophy, and science, but defining it in a non-controversial manner applicable to all fields of study has consistently eluded the greatest scholars. A simple definition states that "time is what clocks measure".
Time is one of the seven fundamental physical quantities in the International System of Units. Time is used to define other quantities — such as velocity — so defining time in terms of such quantities would result in circularity of definition. An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called spacetime bring questions about space into questions about time, questions that have their roots in the works of early students of natural philosophy.

The Song Dynasty (Chinese: 宋朝) was a ruling dynasty in China between 960 and 1279; it succeeded the Five Dynasties and Ten Kingdoms Period, and was followed by the Yuan Dynasty. It was the first government in world history to issue banknotes or paper money, and the first Chinese government to establish a permanent standing navy. This dynasty also saw the first known use of gunpowder, as well as first discernment of true north using a compass.
The Song Dynasty is divided into two distinct periods: the Northern Song and Southern Song. During the Northern Song (Chinese: 北宋, 960–1127), the Song capital was in the northern city of Bianjing (now Kaifeng) and the dynasty controlled most of inner China. The Southern Song (Chinese: 南宋, 1127–1279) refers to the period after the Song lost control of northern China to the Jin Dynasty. During this time, the Song court retreated south of the Yangtze River and established their capital at Lin'an (now Hangzhou). Although the Song Dynasty had lost control of the traditional birthplace of Chinese civilization along the Yellow River, the Song economy was not in ruins, as the Southern Song Empire contained 60 percent of China's population and a majority of the most productive agricultural land. The Southern Song Dynasty considerably bolstered its naval strength to defend its waters and land borders and to conduct maritime missions abroad.