In Ocado's grocery warehouses, thousands of mechanical boxes move on the Hive. Are they all individual robots? Or is this one giant hive mind? • Thanks to Ocado: https://www.ocadogroup.com/technology/technology-pioneers (this video is not sponsored, and they had no editorial control).

Reference: Strandwitz P. (2018). Neurotransmitter modulation by the gut microbiota. Brain research, 1693(Pt B), 128–133. https://doi.org/10.1016/j.brainres.2018.03.015 -- I should probably have put a "might" in there, but that's a thorough review of research and I think the claim just about holds up!

Edited by Michelle Martin (@mrsmmartin)

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Thanks to Grant Hurst for suggesting the title

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