This is often interpreted as strong support for a recent modern human expansion out of Africa.

The Committee did not explain why it thought that human expansion into the solar system must involve a planetary surface.

Space is the next major area for human expansion.

The reasons in each case are the same: the sheer weight of human expansion and overpopulation.

Before that, human expansion went on hit or miss.

Plasma engine advances would also speed up human expansion into space.

They will now understand the scope of the human expansion, far greater than their own.

As such it is constantly under threat by human expansion and development.

And so the Ghosts had been able to hold up human expansion for fifty years.

Too much chance for instability to develop if he allowed human expansion so far beyond the borders of the Director- ate.