What is one thing you changed this year that actually stuck?

Not the resolution you dropped in February. The small change that is still there: a habit, a tool, a rule for yourself, a thing you stopped doing.

What was it, and what made it stick when the others did not? Mine: the automatic transfer on payday. It stuck because I never see the money.

Sunscreen every morning, even in winter, even at home. It stuck because it lives next to the toothbrush.

Writing down what I fixed and how. A plain text file, one line per problem. Six months in it is the most useful document I own.