Here are my Secrets of Adulthood.

Although these items may not seem particularly profound, each one was a revelation when I finally figured it out:

• The best reading is re-reading.
• Outer order contributes to inner calm.
• The opposite of a great truth is also true.
• You manage what you measure.
• By doing a little bit each day, you can get a lot accomplished.
• People don’t notice your mistakes and flaws as much as you think.
• It’s nice to have plenty of money.
• Most decisions don’t require extensive research.
• Try not to let yourself get too hungry.
• Even if you think they’re fake, it’s nice to celebrate Mother’s Day and Father’s Day.
• If you can’t find something, clean up.
• The days are long, but the years are short.
• Someplace, keep an empty shelf.
• Turning the computer on and off a few times often fixes a glitch.
• It’s okay to ask for help.
• You can choose what you do; you can’t choose what you LIKE to do.
• Happiness doesn’t always make you feel happy.
• What you do EVERY DAY matters more than what you do ONCE IN A WHILE.
• You don’t have to be good at everything.
• Soap and water removes most stains.
• It’s important to be nice to EVERYONE.
• You know as much as most people.
• Over-the-counter medicines are very effective.
• Eat better, eat less, exercise more.
• What’s fun for other people may not be fun for you—and vice versa.
• People actually prefer that you buy wedding gifts off their registry.
• Houseplants and photo albums are a lot of trouble.
• If you’re not failing, you’re not trying hard enough.
• No deposit, no return.

Gretchen Rubin is the author of the #1 New York Times Bestseller, The Happiness Project—an account of the year she spent test-driving the wisdom of the ages, current scientific studies, and lessons from popular culture about how to be happier. On her popular blog, The Happiness Project, she reports on her daily adventures in the pursuit of happiness. Gretchen is also on Facebook and Twitter.