mamasing

I agree, I heard that astronaut cannot pee or shit while they are in space.
9 y& T8 A( T* Atvb now,tvbnow,bttvbIt must be a painful joruney.4 W6 J. D$ |+ q4 n( S) I
Oh BTW, if your lecturer talks about "地心引力" in your Physics class.
: E) X1 z7 S  _$ f7 V2 D- Q! A1 T公仔箱論壇I suggest you pack and pick other subject instead, if you really like Physics, 8 ], R" V. l8 \$ v, x% ~
you need to switch school.
- j. @& o9 e0 p! `2 RThere is no 地心引力, but "gravitational" force only." D' ]) J* _7 e2 ~* y- k2 n/ j
A simple meaning of Gravitational force = the force of attraction between any 公仔箱論壇3 r0 t6 }% c  K0 ]; x2 d
two masses.tvb now,tvbnow,bttvb' j9 m0 l' R7 h5 C
tvb now,tvbnow,bttvb! b# O8 a9 ?& N' ?. |1 }3 c
Gosh, I got fooled by my HK Physics teacher many years ago.