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In a study of about 20,000 coin flips, people who got a coin result for a big change made the change more often. After 6 months, the people who made the change were happier.

A study of 600,000 US homes found that letters that compared the energy use of each home with its neighbors decreased energy use by about 2%. The effect was similar to a price increase of 11% to 20%.

3 field experiments with 4,867 developers tested an AI code assistant at Microsoft, Accenture and a Fortune 100 company. Developers with the tool finished 26% more tasks.

A study with 758 BCG consultants found that AI made them faster and better on tasks that AI does well. On a task that AI does badly, consultants with AI were 19 percentage points less likely to be correct.

In an MIT experiment with 453 professionals, ChatGPT decreased the time for writing tasks by 40%. The quality of the writing increased by 18%.

A study of 5,179 support agents found that an AI assistant increased the number of problems that agents solved per hour by 14%. New and less skilled agents improved by 34%. The best agents improved very little.

A review of 50 experiments with 5,036 people found that, on average, more choice did not decrease purchases. The effect was large in some studies. In other studies, there was no effect.

A trial with 682 colonoscopy patients found that patients remembered a slightly longer procedure with a gentler end as less painful. These patients were also more likely to return.

Gym visits, searches for "diet" and goal sign-ups all increased after fresh-start dates. Fresh-start dates are dates such as a new week, a new month and a birthday.

In a GitHub test with 95 developers, the group with GitHub Copilot finished a coding task 55.8% faster than the group without it.

Harvard tests on travel and dating sites found that people often liked a slower search more when the site showed the work that it did. When people saw the effort, the result felt more valuable.

At Bing, a small change to the ad headlines increased revenue by 12%. Nobody tested the idea for months, because the team thought that it was not important.

A study of 7,752 gym members found that people on a monthly plan paid more than $70 a month and went 4.3 times. They paid about $17 per visit when a $10 visit pass was available.

In a Harvard test, people who built an IKEA box themselves would pay 63% more for it. The same box built by someone else was worth less to them.

When a large US company enrolled new staff in its retirement plan by default, the share in the plan went from 37% to 86%. Most people also kept the default savings rate.

In an online test, 82% of people stayed organ donors when that was the default. Only 42% chose it when they had to opt in.

When day care centers in Israel added a small fine for late pick-up, late pick-ups almost doubled. They stayed high after the fine was removed.

In an MIT test, students wrote the last two digits of their social security number before they bid on products. Students with high numbers bid 216% to 346% more.

At a car wash, a 10-stamp card with 2 free stamps was finished by 34% of customers. An 8-stamp card with no free stamps was finished by only 19%, although both needed 8 washes.

In a store test, 24 jams brought more people to the table, but only 3% bought. With 6 jams, 30% of the visitors bought.