This is the best summary I could come up with:

In 2005, a group of four cheeky MIT graduate students set out to answer the question with, “On the Effectiveness of Aluminium Foil Helmets: An Empirical Study.”

When Gizmodo reached Recht’s former professor at MIT in 2005, who oversaw the lab the experiment took place in, he emailed back, “That was a joke, which got taken surprisingly seriously.” In the jokey study, the authors say:

The authors even offer their own conspiracy theory, writing about how tin foil hats amplify certain waves reserved for government communications:

Before you go wrapping your entire head in foil, remember that even in a perfect lab environment, Faraday cages can be difficult to create.

The emergence of 5G towers has fueled a newfound fear of electromagnetic radiation, spurring a resurgence in modern products promising Faraday cage abilities to protect people from the so-called dangers.

In the last few months, cell outages, the Baltimore Key Bridge collapse, and a solar eclipse have spurred fresh crops of conspiracies for the internet to feast on.

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