引力的存在是最明显的实验事实，但从理论角度来看，它是最神秘的力量。

How will you use your gifts？ What choices will you make？

Objects have always been carried, sold, bartered, stolen, retrieved and lost. People have always given things to other people.

我生来就是为了唱歌，也生来就是为了战斗。