Humans begin to stand between 8 and 12 months of age.

At some point, humans began using fire for heat and cooking.

But in some of the spiral arms, humans at last began to hold their own.

Humans began living in the watershed over 10,000 years ago.

Data remained silent, while the humans all began to speak at once.

It is used for the long period of time before writing was invented and humans began to write down information about their lives.

Humans began to understand the true scale of geological time in the early 19th century.

But he expects that within five years, humans could begin to benefit from the work.

Agriculture had a major impact; humans began to affect the environment as never before.

Two humans begin to walk across the field towards him, and he asks them the way to the library.