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Wandering the streets, shouting loudly or speaking incoherently. Last year in Rotterdam, around 9,000 reports were received about people whose behaviour was incomprehensible or confused. But what actually lies behind that behaviour? And why is it not always possible to provide the right help? Forensic psychologist Josanne van Dongen from the Erasmus School of Social and Behavioural Sciences explains it all in the sixth episode of the science podcast 'Oh Ja Joh?!'.

• Want to know more about the podcast? Have a look at Erasmus Extra.

Imagine you have enough money to retire at a young age. No more work and no more obligations. This is the principle behind FIRE: Financial Independence, Retire Early. In the fifth episode of "Oh Ja Joh?!", Professor of the Philosophy of Economics Conrad Heilmann discusses the pros and cons of FIRE: a method that promises financial freedom at a young age.

• Want to know more about the podcast? Have a look at Erasmus Extra.

Big Dutch pop artists such as Guus Meeuwis, Suzan & Freek and Roxy Dekker make a comfortable living and even earn a substantial income. But for most musicians, this is not the case. They earn considerably less. In the fourth episode of "Oh Ja Joh?!", we speak to media researcher Yosha Wijngaarden about her research into the salaries of Dutch pop artists.

• Read the full report (Artist Monitor 2025) on .
• Want to know more about other studies? Check out our online magazine Erasmus Extra.