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37. Watch the birds in your backyard.

If one bird startles and flies off, others will follow, not waiting around to assess whether the threat is real. They have been infected by emotional contagion.

(A) Marc wondered whether the birds in line were more fearful because they didn’t know what their flockmates were doing. Emotional contagion would have been impossible for individual grosbeaks in the linear array except with their nearest neighbors.

(B) In a long-term research project that Marc did w...