Extras

Eye-catching studies that didn't make the final cut:

Explaining differences in international tipping customs in terms of national personality types.

The evolutionary foundations of maths.

A survey of randomly controlled trials (RCTs) in psychology concludes: "that published RCTs focus on statistical significance tests ('Is there an effect or difference'), and neglect other important questions: 'How large is the effect' and 'Is the effect clinically important.'"

Helping patients generate alternative solutions to interpersonal problems may help prevent repeated self-harm.

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