The brain shifts up, back in microgravity

ASK THE DOCTORS

Dear Doctors: As a former NASA mission planner, I would signal a “no-go” for human colonization of the moon and Mars. The human body’s functions cannot tolerate the long-term effects of a low-gravity environment. I assume, from your column about the effects of low gravity, you agree?

Dear Reader: You are referring to a column prompted by a reader’s son, who became fascinated by the d…