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Free to learn: why unleashing the instinct to play will make our children happier, more self-reliant, and better students for life

Crossref DOI link: https://doi.org/10.1186/s12052-016-0052-0

Published Online: 2016-02-09

Published Print: 2016-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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