| 1 | This is hard lesson to learn. | |
| 2 | "These people were trying to make ethology a hard science," Goodall recalls. | |
| 3 | Whatever else it may be, everyone's always agreed that modern poetry is difficult. You will probably too. | |
| 4 | It wasn't that long ago that the study of consciousness was considered to be too abstract, too subjective or too difficult to study scientifically. | |
| 5 | It was too difficult for us to understand at the time, but he still liked doing it. |
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