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3. Echoes and ears
4. Light
5. Shadows
6. Refraction
8. Friction: part II
9. Inclined plane
10. Levers
11. Wheels
12. Wedges
13. Lightning and electricity
14. Rain
16. Water pressure
17. Density
COMING SOON: 18. Surface tension
19. Kinetic energy
20. How plants grow: part I
21. How plants grow: part II
23. Weighing air
24. Air pressure: part I
25. Air pressure: part II
26. Air pressure: part III