科普知识
Total Visits ： 4080
Area visits Ranking
| Top Country Views | Visits |
| United States | 17 |
| China | 7 |
| United Kingdom | 3 |
| Germany | 1 |
| Moldova | 1 |
| Top City Views | Visits |
| Ashburn | 10 |
| San Mateo | 4 |
| Rhyl | 3 |
| Beijing | 2 |
| Zhengzhou | 2 |
| Boydton | 1 |
| Guangzhou | 1 |
| Pingdingshan | 1 |
| San Jose | 1 |