Science journal

In this photo provided by researcher Rui F. Oliveira, a zebrafish, bottom, is monitored to see its reaction to a video of another at a laboratory in Oeiras, Portugal in March 2023. A study published on Thursday, March 23, 2023, in the journal Science shows that a relaxed fish can detect fear in other fish, and then become afraid itself – and that this ability is regulated by oxytocin, the same brain chemical that underlies the capacity for empathy in humans. (Rui F. Oliveira via AP)
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