Sputnik 1, launched in 1957 by the USSR, was the first artificial satellite, beginning the space race.

Aristotle tutored Alexander, influencing his leadership and spreading Greek philosophy across conquered regions of the ancient world.

The Great Depression began with the US stock market crash of 1929, leading to global economic hardship throughout the 1930s.

Henri Becquerel discovered radioactivity in 1896, later studied by the Curies and vital for nuclear science.

The Terracotta Army in Xi’an was built for Qin Shi Huang, China’s first emperor, symbolizing his power and afterlife beliefs.