Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend.

The concept of a multiverse arises naturally from the inflationary model of the universe.

The past is a shadow that follows us everywhere.

地质学研究的真正魅力在于从已知到未知的思维锻炼。

The crime and not the scaffold makes the shame.