Definition:

1. People have a particular happiness level that we return to after good or bad events, a process called hedonic adaptation.

Insights:

1. Hedonic adaptation helps us move on from tragedy; but also means that joy from positive events doesn't stick around for long.
2. Humans are so effective at adapting, we can often take things for granted.
3. We can raise our base level of happiness: "happiness is hackable."

Principles:

1. Practice gratitude.
2. Practice forgiveness.
3. Practice giving.

Insights:

1. Teachers expectations of students can become a reality.