物体的加速度与所受的合外力成正比，与物体的质量成反比。加速度的方向与合力的方向相同。
The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
The best science fiction is not about the future; it's about the present.
Ambition leads me not only farther than any other man has been before me, but as far as I think it possible for man to go.
To write is to descend into the abyss of oneself.
The best ideas often come from those who work closest to the problem.