[請加上繳交日期]suggest 20 questions about science ~

suggest 20 questions about science in simple life!!!!!! (not so easy but not so diffcult)  Even everyone suggest one question,,that is ok!!!!!!!
PLEASE PROVIDE THE ANSWER ALSO~
THX FOR HELP~

[[i] 本帖最後由 cHoi_vy 於 2007-7-10 04:30 PM 編輯 [/i]]