Since that's his own concern, we better not interfere.

He should stop his selfish behavior.

We should live our lives to the fullest.

His energy is unstoppable.

He achieved glory after much hardship.

The balance of intestinal bacteria greatly affects health.

Archaebacteria are one of the oldest life forms on Earth.

I paid my taxes for this year.

He is deeply studying about the equal temperament of the piano.

This problem can be solved with a recursive approach.