World Trade Center Opens in New York City (1973)

With seven buildings and a shopping concourse, the World Trade Center in lower Manhattan was the largest commercial complex in the world before it was destroyed in the September 11, 2001, terrorist attacks. Its most prominent structures were the 110-story rectangular Twin Towers, which, at more than 1,360 ft (415 m) tall, were the tallest buildings in the world until the Sears Tower surpassed them in 1974. How did the construction of the complex lead to the expansion of the island of Manhattan? Discuss

As the World Turns Premieres (1956)

Soap operas began in the early 1930s as 15-minute radio episodes and continued in that format when they began appearing on TV in the early 1950s. As the World Turns premiered as the first half-hour TV soap. The show, which primarily focused on two professional families in the fictional town of Oakdale, Illinois, ran for 54 years and aired nearly 14,000 episodes. For 20 of those years, it was most-watched daytime drama in the US. What interrupted a live broadcast of the show in 1963? Discuss

Apple Inc. Is Formed (1976)

Apple Computer, Inc., was the first successful personal computer company. The company has its roots in the Jobs family’s garage, where cofounders Steve Jobs and Steve Wozniak assembled the first Apple computer. Consisting of a handmade motherboard, the Apple I did not even include a monitor or keyboard. The Apple II, introduced the next year with a plastic case and color graphics, launched Apple to success. By 1980, Apple had earned more than $100 million. How much did an Apple I cost in 1976? Discuss

UNIVAC Computer Delivered to the US Census Bureau (1951)

By 1870, the US population was so large that hand-counting the census was no longer feasible. Despite the invention of a counting machine, by the time the 1880 census was tabulated, it was almost 1890. Dealing with so much data remained a problem until the late 1940s, when the Census Bureau commissioned the first civilian computer. In 1951, it was used to count part of the 1950 census and was so successful that the bureau bought another. What presidential election did UNIVAC correctly predict? Discuss

Single Convention on Narcotic Drugs Signed (1961)

In 1961, representatives from 73 nations met at United Nations headquarters to draft an international treaty to fight the production, trade, and use of illegal drugs. Their comprehensive convention replaced a prior patchwork of treaties and was entered into force in 1964. It was amended in 1972 and now has more than 180 signatories. Despite its sweeping breadth, the document contains a significant ambiguity that has been interpreted differently by various nations. What is it? Discuss

Knights of Columbus Established (1882)

The Knights of Columbus is the largest Catholic fraternal service organization in the world. Founded by Father Michael McGivney on the principles of charity, unity, fraternity, and patriotism, the organization’s primary purpose was to provide financial aid to members and their families in the event of illness or death. The Knights of Columbus has since donated billions to charity and now has more than 1.8 million members. What personal tragedy led McGivney to found the organization? Discuss

The Palm Sunday Tornado Outbreak (1920)

In 1920, meteorologists did not have modern forecasting equipment, and there was no storm warning system in place in the US. Thus, when an outbreak of storms began near dawn on March 28, 1920, few were prepared for the devastation that followed. Some 400 people were killed and more than 1,200 injured that day by at least 38 recorded tornadoes in the deep South and the Midwest. Why is it likely that both the total number of tornadoes as well as the actual death toll were underreported? Discuss

Good Friday Earthquake near Anchorage, Alaska (1964)

With a magnitude of 9.2, the earthquake that struck east of Anchorage at rush hour on Good Friday 1964 was one of the strongest ever recorded. About 130 people died, most in the subsequent tsunami, and much of downtown Anchorage was destroyed. The quake’s effects were felt around the world—boats were sunk as far away as the Gulf of Mexico. Within a day, 11 aftershocks measuring 6.0 or higher were reported. In the months after, residents endured thousands of smaller ones. How long did they last? Discuss

The Henley Regatta Is Established in England (1839)

Until 1839, the little town of Henley-on-Thames was known primarily as a glass-producing port town. During a town hall meeting that year, Captain Edmund Gardiner proposed holding a regatta, since the growing popularity of rowing could benefit the town. Today, the rowing competition is a world-class competition that draws oarsmen from around the world for five days each summer, with thousands of spectators taking part in its traditions. How did it officially become a “royal” regatta in 1851? Discuss

Triangle Shirtwaist Factory Fire Kills 146 (1911)

The Triangle Shirtwaist Factory was a clothing manufacturer that occupied the top three floors of a 10-story building in New York. In 1911, a small fire flared up in a dustbin on the 8th floor and quickly spread. Tragically, a number of doors had been locked by management to prevent theft, and fire truck ladders only reached the 6th floor. Dozens of workers jumped to their deaths to escape the conflagration, while others burned alive. What sweeping safety reforms were prompted by the disaster? Discuss