A little sarcasm can plant a seed of bitterness and doubt. A brief glance can shame a colleague. A tiny, under-the-breath laugh can cause confusion and paranoia. One misplaced discussion can start a snowball of regret.

One word of encouragement can spark behavior change. A brief glance can empower a colleague. A little note of thanks can increase self-esteem. One thumbs-up can change the course of work.

A little goes a long way. Don’t underestimate it.