Geistig fit bis ins hohe Alter (E-Book)E-bookGeistig fit bis ins hohe Alter (E-Book)
Practical strategies for keeping your memory and mind sharp as you age: everyday habits, brain training and social activity. In German. Details
Schlaf im 21. Jahrhundert (E-Book)E-bookA 260-page e-book from YouTube's largest German sleep channel: how sleep works and practical ways to sleep better in modern life. In German.
Updated: October 2026
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