A picture of two people hugging has gone viral on Twitter because it's hard to tell who is hugging who. See the trippy optical illusion here.

This "brain-bending" optical illusion, as reported in news.com.au, features two people hugging on a beach - a seemingly innocent scene - until you try to take in what on earth is going on with ...

They enlisted 48 participants — all women, “due to resource constraints” — to pair up and hug one another at intervals of one, five or 10 seconds, and in two different hugging patterns ...

To steal a line from Britney Spears, there are two types of people in the world: those who consider themselves huggers and those who don’t. You can typically figure out what camp someone falls ...

The study talked to 404 people every night over a two-week period. Participants were asked if they experienced conflict, if they received a hug and what their mood was, among other things.