NASA astronauts have only managed to live continuously on the International Space Station (ISS) for a year and Biosphere 2 on Earth failed at two years of uninterrupted human habitation. Both cases required extracting the sickened people from the toxic environments. At this point it is ludicrous to talk about a permanent manned base on Mars.

When a subject becomes totally obsolete we make it a required course.

Sometimes doing your best is not good enough. Sometimes you must do what is required.

We can only be enlightened to the meaning of wise words only and only if life have put and made us requiring them.

I have had all of the disadvantages required for success.

Thoughts have creative energy exhilaration is required to creates dissolves and recreates.

Facts are always required to draw conclusions and make serious decisions.