On January 11, 2012, Joran van der Sloot, a longtime suspect in the 2005 disappearance of American teen Natalee Holloway in Aruba, pleads guilty to the murder of 21-year-old Stephany Flores, in Lima, Peru. Flores was killed on May 30, 2010, exactly five years to the day after Holloway went missing while on a high school graduation trip to the Caribbean island. Her disappearance generated widespread media coverage in the United States.

On February 5, 2012, 36-year-old Josh Powell, who had been in the public eye since police labeled him a person of interest in the 2009 disappearance of his 28-year-old wife, Susan, locks out a social worker then kills himself and his two sons, ages 5 and 7, by setting fire to his Graham, Washington, home.

Whitney Houston, one of the world’s top-selling singers from the mid-1980s to late 1990s, is found dead in the bathtub of her suite at the Beverly Hilton Hotel in Beverly Hills, California on February 11, 2012. Houston’s death was the result of accidental drowning; heart disease and cocaine, which was found in her system, were determined to be contributing factors.

On February 26, 2012, Trayvon Martin, an African American teen walking home from a trip to a convenience store, is fatally shot by George Zimmerman, a neighborhood watch volunteer patrolling the townhouse community of the Retreat at Twin Lakes in Sanford, Florida. Zimmerman later claimed to have shot the unarmed 17-year-old out of self-defense during a physical altercation.

On April 18, 2012, Dick Clark, the TV personality and producer best known for hosting “American Bandstand,” an influential music-and-dance show that aired nationally from 1957 to 1989 and helped bring rock `n’ roll into the mainstream in the late 1950s, dies of a heart attack at age 82 in Santa Monica, California. The clean-cut, youthful-looking Clark, dubbed “America’s Oldest Teenager,” also was the longtime host of the annual telecast “New Year’s Rockin’ Eve” and headed an entertainment empire that developed game shows, awards shows, talk shows, made-for-TV movies and other programs.

On April 26, 2012, former Liberian president Charles Taylor is found guilty of abetting horrific war crimes, including rape and mutilation in Sierra Leone.

Facebook, the world’s largest social network, holds its initial public offering (IPO) and raises $16 billion. It was the largest technology IPO in American history to that date, and the third-largest IPO ever in the United States, after those of Visa and General Motors. At the time it went public, Facebook was valued at $104 billion and had some 900 million registered users worldwide.

On June 15, 2012, 33-year-old aerialist Nik Wallenda becomes the first person to walk across high wire stretched over Niagara Falls, which lie on the border between New York state and Ontario, Canada. More than 100,000 people gather at the falls and 10 million viewers watch on television.

On July 20, 2012, a mass shooting occurs at a movie theater in Aurora, a Denver suburb, killing 12 people—the youngest a 6-year-old girl—and injuring at least 70 others.

On August 4, 2012 in London, Oscar Pistorius of South Africa becomes the first amputee to compete at the Olympics by running in an opening heat of the men’s 400-meter. Pistorius finished second out of five runners and advanced to the semifinals, where he finished eighth out of eight runners. His image would drastically change early the next year when the star athlete was arrested for the murder of his girlfriend. He was found guilty in 2014.

On August 24, 2012, the man who killed 77 people in a July 22, 2011, bombing and shooting attack in Norway is sentenced to 21 years in prison, the maximum allowed under Norwegian law. Anders Behring Breivik, a 33-year-old right-wing extremist with anti-Muslim views, carried out attacks in Oslo, the nation’s capital, and at a youth camp on the nearby island of Utoya because he wanted to call attention to what he referred to as the “Islamic colonization” of Europe and inspire an uprising against it. The attacks were the deadliest the nation of 5 million residents had experienced since World War II.

16 members of a dissident Amish group in Ohio are convicted of federal hate crimes and conspiracy for forcibly cutting the beards and hair of fellow Amish with whom they had religious differences. The government classified the ruthless attacks as hate crimes because beards and long hair have important religious symbolism to the Amish, who are known for their pacifism, plain style of dress and refusal to use many forms of modern technology.

On October 22, 2012, Lance Armstrong is formally stripped of the seven Tour de France titles he won from 1999 to 2005 and banned for life from competitive cycling after being charged with systematically using illicit performance-enhancing drugs and blood transfusions as well as demanding that some of his Tour teammates dope in order to help him win races. It was a dramatic fall from grace for the onetime global cycling icon, who inspired millions of people after surviving cancer then going on to become one of the most dominant riders in the history of the grueling French race, which attracts the planet’s top cyclists.

On December 4, 2012, Bopha, a Category 5 typhoon nicknamed “Pablo,” struck the Philippines. Rushing flood waters destroyed entire villages and killed over one thousand people, in what was the strongest typhoon ever to strike the Southeast Asian islands.

On December 14, 2012, at Sandy Hook Elementary School in Newtown, Connecticut, Adam Lanza kills 20 first graders and six school employees before turning a gun on himself. Earlier that day, he killed his mother at the home they shared.

On December 21, 2012, the music video for "Gangnam Style," a song by the Korean rapper Psy, becomes the first YouTube video to garner one billion views. The video's global popularity is a case study in the power and unpredictability of viral internet content.