1. in your fifties: Ingraham, Christopher. “Under 50? You Still Haven’t Hit Rock Bottom, Happiness-wise.” Wonkblog (blog), Washington Post, August 24, 2017. https://www.washingtonpost.com/news/wonk/wp/2017/08/24/under-50-you-still-havent-hit-rock-bottom-happiness-wise.
2. Happiness is waiting: Clinical depression is something I do not have the expertise to address.
3. sweats every day: Cohen, Jennifer. “Exercise Is One Thing Most Successful People Do Everyday.” Entrepreneur, June 6, 2016. https://www.entrepreneur.com/article/276760.
4. source of marital acrimony: Rampell, Catherine. “Money Fights Predict Divorce Rates.” Economix (blog), New York Times, December 7, 2009. https://economix.blogs.nytimes.com/2009/12/07/money-fights-predict-divorce-rates.
5. We have a caste system: Carnevale, Anthony P., Tamara Jayasundera, and Artem Gulish. America’s Divided Recovery: College Haves and Have-Nots. Georgetown University Center on Education and the Workforce, 2016. https://cew.georgetown.edu/cew-reports/americas-divided-recovery.
6. handful of supercities: Khanna, Parag. “How Much Economic Growth Comes from Our Cities?” World Economic Forum, April 13, 2016. https://www.weforum.org/agenda/2016/04/how-much-economic-growth-comes-from-our-cities.
7. the correlation flattens: Martin, Emmie. “Here’s How Much Money You Need to Be Happy, According to a New Analysis by Wealth Experts.” CNBC Make It, November 20, 2017. https://www.cnbc.com/2017/11/20/how-much-money-you-need-to-be-happy-according-to-wealth-experts.html.
8. Being “in the zone” is happiness: Csikszentmihalyi, Mihaly. 2004. “Flow, the Secret to Happiness.” Filmed February 2004 in Monterey, CA. TED video, 18:55. https://www.ted.com/talks/mihaly_csikszentmihalyi_on_flow.
9. money early and often: Hafner, Peter. “The Top 3 Benefits of Investing in the Markets Early.” Active/Passive, CNBC, September 12, 2017. https://www.cnbc.com/2017/09/12/the-top-3-benefits-of-investing-in-the-markets-early.html.
10. The app 1 Second Everyday: 1 Second Everyday home page, https://1se.co.
11. more social bonds: Schülke, Oliver, Jyotsna Bhagavatula, Linda Vigilant, and Julia Ostner. “Social Bonds Enhance Reproductive Success in Male Macaques.” Current Biology 20 (December 21, 2010): 2207–10. https://bit.ly/2vvjq95.
12. Harvard Medical School Grant Study: Mineo, Liz. “Good Genes Are Nice, but Joy Is Better.” Harvard Gazette, April 2017. https://news.harvard.edu/gazette/story/2017/04/over-nearly-80-years-harvard-study-has-been-showing-how-to-live-a-healthy-and-happy-life.
13. people overestimate the amount of happiness: Norton, Amy. “People Overestimate the Happiness New Purchases Will Bring.” HealthDay.com, January 25, 2013. https://consumer.healthday.com/mental-health-information-25/behavior-health-news-56/people-overestimate-the-happiness-new-purchases-will-bring-672626.html.
14. the joy of children: Mosher, Dave. “Holding a Baby Can Make You Feel Bodaciously High—and It’s a Scientific Mystery.” Business Insider, November 15, 2016, https://www.businessinsider.com/baby-bonding-oxytocin-opioids-euphoria-2016-10.
15. keys to a healthy relationship: Firestone, Lisa. “Forgiveness: The Secret to a Healthy Relationship.” Huffington Post, October 15, 2015. https://www.huffpost.com/entry/forgiveness-the-secret-to-a-healthy-relationship_b_8282616.