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| Spec | Wikipedia | Encyclopaedia Britannica | Khan Academy |
|---|---|---|---|
| Category | Education & Learning | Education & Learning | Education & Learning |
| Pricing | Free | Free articles + Premium | Free |
| Rating | 4.7 (120,000) | 4.7 (38,000) | 4.8 (54,000) |
| Community | 96/100 | 92/100 | 95/100 |
| Tier | featured | featured | featured |
| Best for | encyclopedia, reference, free, research | encyclopedia, reference, research, articles | courses, maths, free, k12 |
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