Who discovered insulin in 1921?

Rousseau’s 1762 work *The Social Contract* argued for collective governance where sovereignty belongs to the people, shaping democracy.

Orville and Wilbur Wright achieved the first powered flight on December 17, 1903, at Kitty Hawk, North Carolina.

Gold has atomic number 79 and symbol Au; its rarity and properties have made it historically valuable for currency and jewelry.

The Epic of Gilgamesh is a Mesopotamian poem from Sumer, considered the world’s earliest surviving literary masterpiece.

Darius I constructed Persepolis around 518 BCE as a ceremonial capital of the Achaemenid Empire. This is a well-documented historical or scientific.