Why do ukuleles go out of tune?

Related questions

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3. What are the dots on the neck of a ukulele?
4. Do I need a ukulele humidifier?
5. When should I change my ukulele strings?
6. Are all ukulele strings nylon?
7. Are all ukulele strings the same thickness?
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Tags

1. #extra
2. #instruments
3. #ukuleles
4. #stringed
5. #humidity
6. #regularly
7. #prone
8. #stretchy
9. #slight
10. #especially
11. #their
12. #cause
13. #after
14. #falling
15. #strings
16. #temperature
17. #changes
18. #tuned
19. #settled