Library

Many choices, few decisions? The story of the jam experiment

In a Californian supermarket, a table with 24 kinds of jam attracted more people than one with 6. But far fewer bought. This experiment became the symbol of the "paradox of choice". What do we know today?

3 November 2026 / 2 min read

Does willpower run down like a battery? The story of "ego depletion"

For many years psychologists believed that willpower is a limited resource that is used up with use. Then replications were run in dozens of laboratories, and the picture changed.

3 November 2026 / 5 min read

"Power posing": what remains of one of the best-known ideas about confidence

For several years millions of people were advised to stand for two minutes with their hands on their hips before an interview. The history of this idea shows how science works, and what you can do instead.

3 November 2026 / 5 min read