1. It is manmade.
2. It is not alive, nor will it ever be alive, nor has it ever been alive.
3. You can find it in most homes.
4. It is not electronic.
5. It is not a rocking chair.
6. It is not made of synthetic material.
7. It has been invented in the last 100 years.
8. It was made for people to sit on (technically).
9. It is not some sort of tool.
10. It does not have four legs.
11. EDIT-It is found in almost every school.
12. It is not a stool (or chair).
13. It has legs.
14. By itself, it cannot move.
15. It is not made of plastic.
16. You would not find it in the kitchen.
17. It does not have wheels.
18. You could (probably) buy it for less than 20 dollars (10 pounds)
19. yes, you should all give up.
NOTE: for this round the question limit will be extended to 21 (to compensate for #19

)