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February Presidents Day. The French and Indian War. French Revolution. Greek Philosophy. Greek Science. How did life in Egypt affect medicine. Immigrants in America. Industrial Revolution. Industrial revolution. Ireland in conflict personalities of Islam - History, Value, Cultures. JFK Assassination. Leonardo da vinci. Lincoln and the emancipation proclamation. Louis Pasteur.

Magellan and Coronado. Martin Luther King. Medieval Top Trumps Word file. Middle Ages of Europe. Minoans and Mycenaeans. Pearl Harbor. Persian Wars. Presidents of the Philippines. The Railroads. Roman Empire. R has a number of quick, elegant ways to join data frames by a common column.

Bureau of Transportation Statistics. Or, download these two data sets — plus my R code in a single file and a PowerPoint explaining different types of data merges — here:. The mydf delay data frame only has airline information by code.

One base R way to do this is with the merge function, using the basic syntax merge df1, df2. You can also tell merge whether you want all rows, including ones without a match, or just rows that match, with the arguments all. So, all. Full code:. The new joined data frame includes a column called Description with the name of the airline based on the carrier code. Despite their success, however, use of these platforms carried significant risks and repercussions, including detection and even pilot loss, such as the downing of the U-2 flown by Francis Gary Powers in Ever-evolving research by the CIA led to the development concept of unmanned aerial vehicles UAVs as collection platforms.

An innovative Agency program in the s codenamed Aquiline was the very first to test this concept. Based initially on the study of flight characteristics of birds, Aquiline was envisioned as a long-range vehicle that could safely and stealthily provide a window into denied areas such as the Soviet Union through photography and other capabilities, and would even support in-place agent operations. While it never became operational, the concept proved invaluable as a forerunner to today's multi-capability UAVs.

This collection includes a broad sampling of articles from the National Intelligence Daily—the CIA's principal form of current intelligence analysis at the time—from February to March These articles represent much of the Agency's short-term analysis of events unfolding in Central and Eastern Europe as popular opposition to Soviet misrule erupted and quickly surpassed anything the Communist regimes were prepared to understand or to which they could respond. The material also represents a major source of information and insight for US policymakers into what was happening in these countries, where the situation was heading, and how a collapse of Communist rule in Europe and the beginnings of the breakup of the Soviet Union would impact Europe and the United States.