| Query | User |
|---|---|
| chinese contribution to the decimal system | entered by user 3262099 |
| history of compass | entered by user 1330676 |
| history of compass | entered by user ditto |
| history of compass | entered by user ditto |
| history of hand plow | entered by user 3656437 |
| invention of the kite | entered by user 383134 |
| zhou inventions | entered by user 22988994 |