Mars to Stay it is assumed the planet will be a magnet for settlers as wage costs will be high. Because of the labor shortage on Mars and its subsequent high pay-scale, Martian civilization and the value placed upon each individual's productivity is proposed as a future engine of both technological and social advancement. In the fifth chapter of "Mars Direct", Zubrin addresses the idea that radiation and zero-gravity are unduly hazardous. He claims cancer rates "do" increase for astronauts who have spent extensive time in space, but only marginally. Similarly, while zero-gravity presents challenges, near total recovery of musculature and immune system
The Race (Worldwar) was growing. Several trips had been taken aboard reusable space shuttles to space and to the Moon and Mars. The partial occupation also had a significant effect on culture and society in general. Ginger, discovered to have a narcotic effect on the Race, is widely grown and stored by various governments. Culturally, humans try to take the occupation in stride, e.g. a song by Spike Jones, referring to Jones' song "Der Fuehrer's Face" from the real-world timeline: The Race (Worldwar) The Race refers to the fictional alien invaders of Harry Turtledove's "Worldwar" tetralogy, "Colonization" trilogy and "Homeward Bound". The aliens,