Re graphics: A picture is worth 10K words - but only those to describe the picture. Hardly any sets of 10K words can be adequately described with pictures.

我们几乎无法避免这样的推论：光是由同一种介质的横向波动组成的，这种介质也是电和磁现象的原因。

你必须度过一些糟糕的日子才能赢得人生中最美好的日子。

The world is full of people who have never, since childhood, met an open doorway with an open heart.

我试着以开放的心态和积极的态度面对生活。