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In [their study](https://doi.org/10.1016/j.cell.2023.09.013), published on Monday in the journal Cell, researchers at the University of Pennsylvania suggest that serotonin reduction is triggered by remnants of the virus lingering in the gut.

Scientists Offer a New Explanation for Long Covid - The New York Times

Pam Belluck

For instance, installing electrical meters in hallways instead of basements reduced energy consumption by one-third in some Dutch suburbs simply because residents had access to information about their use and could adjust how much power they used accordingly.

Thinking in Systems

Blinkist

Where I should probably want to work is Warren Buffet’s [description](https://www.fool.com/investing/general/2016/03/21/warren-buffetts-advice-to-investors-purchase-a-bus.aspx) of an investable business, one “that can be run by a ham sandwich.”

AI Is Breaking Media. Here’s How Publishers Can Survive.

Evan Armstrong

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