| Topic Name | Questions | Unanswered | Members | machine | 255 | 104 | 273 |
|---|---|---|---|
| school | 2,758 | 524 | 2385 | motion | 92 | 38 | 65 |
| uniform | 74 | 20 | 46 | energy | 354 | 86 | 247 |
| mechanical | 75 | 34 | 90 | virtual | 75 | 39 | 81 |
| scientist | 68 | 20 | 55 |
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