検索キーワード： ナレーター "Matthew J. Chandler-Smith" 科学・工学

In the 1850s, the United States was a nation divided. In the North, industrialization and urbanization were both significant drivers of change. In the South, a largely agrarian economy was supported by the institution of slavery. The East and West of the country were also divided, not by social or political differences but by a vast tract of largely untouched, rugged, and often hostile territory. There were just two ways to travel from the East Coast to the Pacific Coast or vice versa.

The Chernobyl Disaster, which occurred in late April 1986, was the worst nuclear accident in history. It not only caused widespread radioactive contamination, but even more importantly, it claimed many lives and caused panic worldwide about the safety of nuclear power. In short, it changed the face of nuclear energy globally.

The 1918 outbreak of the H1N1 strain of influenza, popularly known as the Spanish flu, killed more people worldwide than World War I, which ended the same year. It infected nearly one-third of the world's population and killed 10 percent of those it struck. In its wake, schools and businesses closed, hospitals became overwhelmed, and the sick spilled out into makeshift care centers in public spaces. Policemen, public transportation workers, and everyday citizens in face masks were a common - and eerie - sight.

Werner Heisenberg was one of the greatest physicists of all time. He probed the depths of not just science but the nature of our very existence. His groundbreaking work in quantum mechanics, particularly the formulation of the uncertainty principle, revolutionized our understanding of the subatomic world and earned him the Nobel Prize in Physics in 1932.