| 11. | "20 / 20 " demonstrates an even more graphic controlled experiment.
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| 12. | :You can't possibly do a well-controlled experiment with yourself as subject.
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| 13. | Basically, Barker preferred fieldwork and direct observation rather than controlled experiments.
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| 14. | Several species of corvids have been trained to use tools in controlled experiments.
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| 15. | Unfortunately, few controlled experiments have been conducted to substantiate this.
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| 16. | If that doesn't work, try some controlled experiments to zero in on the problem.
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| 17. | Researchers caution this cache of doomsday genes has been unlocked only in controlled experiments.
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| 18. | The study was what epidemiologists call observational research, as opposed to a controlled experiment.
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| 19. | Other controlled experiments that attempted to replicate Backster's findings have also produced negative results.
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| 20. | In controlled experiments, women often report higher levels of pain.
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