First Human Civilizations

Freydis is the leader of a band of Viking warriors who get as far as Panama. Nobody knows what became of them. Five hundred years later, Christopher Columbus is sailing for the Americas, dreaming of gold and conquest. Even after he is captured by the Tainos, his faith in his superiority and his mission is unshaken. Thirty-nine years after that, Atahualpa, the last Inca emperor, arrives in Europe.

Most scientists believe the evolution of humans has a history as long as life itself. Anatomically modern humans and all other life that has existed on the planet first came about from the single-celled microorganisms that emerged approximately 4 billion years ago. Through the processes of mutation and natural selection, all forms of life developed, and this continuous lineage of life makes it difficult to say precisely when one species completely separates from another.

A global history of free speech, from the ancient world to today Hailed as the “first freedom,” free speech is the bedrock of democracy. But it is a challenging principle, subject to erosion in times of upheaval. Today, in democracies and authoritarian states around the world, it is on the...