Packing for Mars and the various ups and downs

The fact that all the zero's add up to the other zero's as the zero gravity time. may include the

adventurers throwing up and then getting sick on the gravity down (sense of leg muscular failure)

So that all the up = getting sick and all the down= sick as well. The cause is the up/down

= zero which is the currency of space because it can be equated to getting sick in the 2 prior to getting sick in the 1 .Experience of body problems ,but In that case the zero may change of the equation of up=1 and down=2 in cases where there is not problems of up and down ,so that 1/2-1/2 = zero for adventurers with problems and that 1/2+1/2 may also be = 1.In which case there is REAL VALUE in making it in space.

All this is defined in the book by MARY ROACH ; "Packing for Mars".