| why do people yawn study | 1.15 | 0.4 | 7823 | 24 | 45 |
| why do people yawn empathy | 1.44 | 0.6 | 1360 | 26 | 51 |
| do scientists know why people yawn | 0.54 | 0.1 | 7546 | 34 | 98 |
| why do i yawn while studying | 1.76 | 0.1 | 1277 | 28 | 72 |
| why do people yawn | 0.63 | 0.4 | 9646 | 18 | 25 |
| why do we yawn scientifically | 0.48 | 0.6 | 7532 | 29 | 15 |
| yawning why do we do it | 1.73 | 0.9 | 3029 | 23 | 97 |
| reasons why people yawn | 0.33 | 0.6 | 5102 | 23 | 6 |
| why do we really yawn | 0.87 | 0.4 | 5422 | 21 | 36 |
| google why do we yawn | 1.4 | 0.2 | 8258 | 21 | 37 |
| reason why we yawn | 1.49 | 0.6 | 5460 | 18 | 29 |
| why we yawn reasons | 1.25 | 0.3 | 423 | 19 | 5 |
| why would someone yawn frequently | 0.32 | 0.5 | 427 | 33 | 1 |
| why do i keep yawning while studying | 1.52 | 0.8 | 9754 | 36 | 46 |
| why is yawning important | 0.33 | 0.5 | 9393 | 24 | 98 |
| scientific reason behind yawning | 0.15 | 0.8 | 8140 | 32 | 65 |
| the science behind yawning | 1.08 | 0.5 | 5209 | 26 | 84 |
