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The published paper that the article talks about is open access and actually has photos

https://www.sciencedirect.com/science/article/pii/S000169182...

The two hug styles are about the way the arms are crossed

One thing I've always found interesting is the small awkward moment that happens whenever an American and a Mexican meet after some time and proceed to "hug": The American will most likely go for the "shoulder bump greeting" [1] while most Mexicans would go for the standard "criss cross" hug [2]. The result is a couple of seconds of awkward close "dancing".

[1] https://shabait.com/wp-content/uploads/2016/09/sept-21-artic...

[2] https://i.dailymail.co.uk/1s/2021/11/16/14/50559763-0-image-...

One of the linked articles has a good visual reference: https://www.science.org/content/article/how-hug-according-sc...

I also would love a "tl;dr" paragraph, an abstract would help would be readers to device if it's worth reading the whole thing