When did Harvey Ball create the smiley face?

Related questions

1. Can smiling make you feel happier?
2. What causes smile lines?
3. Why do humans smile?
4. Why is a smile contagious?
5. Does smiling give you wrinkles?
6. Is it bad to smile too much?
7. What causes uncontrollable smiling?
8. How much money did the smiley face make?
9. Does fake smiling make you happy?
10. Can you fake a genuine smile?

Tags

1. #employed
2. #world
3. #minutes
4. #attempt
5. #image
6. #solve
7. #other
8. #harvey
9. #freelance
10. #increase
11. #smiley
12. #changing
13. #bigger
14. #artist
15. #created
16. #simple
17. #morale