mamasing

I agree, I heard that astronaut cannot pee or shit while they are in space.
2 p2 ]2 B7 t! m2 M+ k6 V: _' j& |公仔箱論壇It must be a painful joruney.
& r  u4 A+ ~4 ~4 G0 btvb now,tvbnow,bttvbOh BTW, if your lecturer talks about "地心引力" in your Physics class.5.39.217.76+ G6 X5 P* c" \5 O( d. T( t
I suggest you pack and pick other subject instead, if you really like Physics, tvb now,tvbnow,bttvb) s0 B/ T- ]' w  z# @
you need to switch school.5.39.217.76! H7 @* W: l2 i+ s3 T
There is no 地心引力, but "gravitational" force only.5.39.217.76  T$ e) X# p- @
A simple meaning of Gravitational force = the force of attraction between any ; \0 C7 F: m4 _% X* D1 n/ d& [
two masses.5.39.217.760 Y9 k2 y2 P4 g% f8 g0 B

8 i+ d. ?: w5 Y. o7 k; MGosh, I got fooled by my HK Physics teacher many years ago.