Puma Punku: The Ancient Stones That Still Puzzle Engineers

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  Quick Facts: Location: Tiwanaku, near Lake Titicaca, Bolivia | Date/Year: Built c. 500-600 CE | Status: Partly solved (builders known, methods debated) | Largest sandstone block: roughly 131 tons The Stone Puzzle at 12,600 Feet: Inside Bolivia's Puma Punku Picture a field of gray and red blocks scattered across the Bolivian Altiplano, each one cut with right angles so crisp they look machined. Some are shaped like the letter H. A few weigh as much as a loaded Boeing 737. Nobody has ever found the instruction manual. The Door of the Puma Puma Punku sits about 3,850 meters (12,600 feet) above sea level, roughly 70 kilometers west of La Paz. The name comes from Aymara and is usually translated as "Door of the Puma." It forms part of the larger Tiwanaku complex, the ceremonial heart of a civilization that dominated the Lake Titicaca basin from around 500 to 1000 CE. UNESCO added Tiwanaku to the World Heritage List in 2000. The Tiwanaku people left no written langua...

JFK Assassination: What the Warren Commission Actually Concluded

President Kennedy and Jacqueline Kennedy riding in the presidential motorcade through Dallas on November 22, 1963

DALLAS — More than six decades after shots rang out across Dealey Plaza, the assassination of President John F. Kennedy remains one of the most closely studied and debated events in American history — even though the federal government closed its official investigation nearly sixty years ago.

What Happened That Day

Official White House portrait of President John F. Kennedy, 1963

The core facts of November 22, 1963, are well established and largely undisputed. Just after 12:30 p.m., President Kennedy was traveling through downtown Dallas in an open-top motorcade when gunfire erupted near the Texas School Book Depository. Kennedy was struck twice — once in the upper back and once fatally in the head. Texas Governor John Connally, seated in the same vehicle, was also wounded in the attack.

Kennedy was rushed to Parkland Memorial Hospital, where he was pronounced dead a short time later. Later that same afternoon, Vice President Lyndon B. Johnson was sworn in as president aboard Air Force One, with Jacqueline Kennedy standing beside him, still wearing the blood-stained pink suit from earlier that day.

Arrest — and a Suspect Silenced

Warren Commission exhibit photograph showing the sixth-floor window of the Texas School Book Depository

Within hours of the shooting, Dallas police took Lee Harvey Oswald into custody. Oswald, 24, was a former U.S. Marine who had briefly defected to the Soviet Union before returning to the United States. He worked at the Texas School Book Depository and had reportedly been seen on the sixth floor of the building shortly before the shots were fired. During his brief time in police custody, Oswald denied any involvement in the assassination.

Two days later, while being moved between jail facilities, Oswald was shot and killed by Dallas nightclub owner Jack Ruby. The shooting occurred in front of live television cameras and was witnessed by millions of Americans as it happened, adding another layer of shock to an already chaotic week.

A Federal Commission Takes Over

With Oswald dead and unable to stand trial, the task of determining what had happened fell to a specially appointed federal panel. President Johnson established the President's Commission on the Assassination of President Kennedy — widely known as the Warren Commission — just one week after the shooting. Chaired by Chief Justice Earl Warren, the Commission was charged with investigating not only the mechanics of the shooting but also whether any broader conspiracy, foreign or domestic, had played a role.

Ten Months of Investigation

Over the following ten months, the Warren Commission carried out an extensive review of the case. Investigators interviewed 552 witnesses, examined ballistics and forensic evidence, reviewed Oswald's personal background and travel history, and closely studied the Zapruder film — an amateur home movie that had captured the assassination in detailed, frame-by-frame footage.

The Commission released its final report in September 1964. The document ran 888 pages and was accompanied by 26 additional volumes containing hearing transcripts, exhibits, and supporting evidence.

What the Commission Concluded

The Warren Commission's central finding was direct: Lee Harvey Oswald had acted alone. According to the report, Oswald fired three shots from a sixth-floor window of the Depository using a bolt-action rifle that investigators traced back to a mail-order purchase made under an alias connected to Oswald.

Of the three shots, one missed the presidential limousine entirely. A second bullet struck Kennedy in the back, exited through his throat, and continued on to strike Governor Connally, producing multiple wounds — a sequence that became widely known as the "single bullet theory." The third and final shot struck President Kennedy in the head, causing the fatal injury.

The Commission also determined that Jack Ruby had acted on his own when he killed Oswald, finding no evidence linking the two men or suggesting any coordinated plan between them. Investigators ultimately found no credible evidence tying Oswald to a foreign government, an organized crime network, or any wider conspiracy.

A Verdict the Public Never Fully Accepted

Despite the scale and formality of the investigation, public confidence in the Commission's findings began to erode almost immediately — and it has never fully recovered. Decades of polling have consistently shown that most Americans doubt the "lone gunman" conclusion, even though no competing theory has ever been supported by comparable physical evidence.

Much of the ongoing skepticism centers on the single bullet theory. Critics have long argued that the trajectory required for one bullet to cause so many wounds across two people, while remaining largely intact, seems statistically improbable. Defenders of the Commission's conclusions point to later forensic and ballistic reviews — including a 1978 congressional investigation using more advanced technology — that largely reinforced the plausibility of the original findings. That same 1978 review, however, controversially suggested the possibility of a second gunman based on disputed acoustic evidence, a conclusion the National Academy of Sciences later disputed.

Declassified Records Over the Decades

In the years since the assassination, the U.S. government has gradually released additional records related to the case. The 1992 JFK Records Collection Act required the eventual declassification of assassination-related files, a process that has unfolded in phases, with further documents released as recently as the past few years.

While these releases have given historians new insight into Cold War-era intelligence operations, they have not fundamentally changed the Warren Commission's core conclusions about the shooting itself.

Why the Case Still Resonates

For many historians, the lasting fascination with the JFK assassination has less to do with unresolved physical evidence and more to do with the emotional and psychological weight of the event. The sudden, public death of a sitting president — captured on film and unfolding in under ten seconds — has proven difficult for the public imagination to fully reconcile with a simple explanation.

Several scholars have noted that losing a national leader to a single individual, rather than to a large, identifiable conspiracy, can feel disproportionate to the scale of grief and disruption that followed. That perceived gap between the enormity of the loss and the simplicity of the official explanation has helped sustain decades of alternative theories, according to researchers who study the case.

Dealey Plaza Today

The John F. Kennedy Memorial in downtown Dallas, erected in 1970 near the assassination site

More than sixty years later, Dealey Plaza remains both an active city street and a site of quiet historical pilgrimage. Visitors regularly stop at the grassy knoll and look up toward the sixth-floor window, retracing the sightlines described in the Warren Commission's report.

The Sixth Floor Museum, located in the very building from which Oswald fired, draws hundreds of thousands of visitors each year. The museum presents a document-based account of the assassination and the investigation that followed, without advocating for any particular alternative theory.

An Official Record That Hasn't Changed

Today, the government's official position remains unchanged: Lee Harvey Oswald acted alone in killing President Kennedy. Yet for a large portion of the American public, the case continues to feel less like a settled matter and more like an open question — a reminder that even extensively documented historical events can leave behind doubts that persist long after the official investigation has closed.

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