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Can you work out the logic behind this sequence?

Fact Lab

Vandaag in het nieuws

Achteraf doorgaan met het spelen van de quiz
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Interessant feit:

Did you know that you really can think with your guts? Our intestines contain 30 types of neurotransmitters and 100,000 neurons. It is our gut bacteria that makes serotonin – the happy hormone.

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