The life expectancy of people going to Mars may be decreased by the higher level of radiation that they receive.

I suggest that going to Mars means permanence on the planet - a mission by which we are building up a confidence level to become a two-planet species.

The irritation level is just a lot higher.

Going to Mars would evolve humankind into a two-planet species.

In 1930, the death rate for Milwaukee’s blacks was nearly 60 percent higher than the citywide rate, due in large part to poor housing conditions.

There will come an age when our average life expectancy will reach 200 years.