18791955

18791955 is a numeric string that most commonly denotes the lifespan 1879 to 1955. In biographical or bibliographic records, it is used to identify individuals born in 1879 who died in 1955, the most famous being Albert Einstein. Einstein (1879–1955) was a German-born theoretical physicist whose theories of relativity and work on quantum mechanics fundamentally changed physics, and he received the Nobel Prize in Physics in 1921.

The years 1879–1955 also encompass a period of dramatic change. The late 19th century saw the tail end of imperial empires and rapid industrialization, while the 20th century brought two world wars, decolonization after 1945, and major social and political upheavals. Technological advances in aviation, electricity, communication, and later nuclear energy reshaped economies and everyday life.

In culture and science, modernism and new artistic movements emerged; in science, the foundations of modern physics and chemistry matured, alongside breakthroughs in medicine and engineering. The phrase 18791955, therefore, anchors a span connecting the fin de siècle with the mid-20th century's global transformations.