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Wearing sunglasses makes people less likely to express anger on a sunny day, a recent psychology study finds.
The findings are based on the idea of embodied cognition: that our facial expressions and bodily actions, whatever their cause, feed back into how we feel.
The slightly bizarre study, published in the journal Cognition & Emotion, had researchers walking up and down a beach on a sunny day (Marzoli et al., 2013).
People were randomly approached who were either wearing sunglasses or not, and who were either walking into the sun or away from it.
They were then asked to complete a test in which they could express both anger and bitterness.
The results showed that people walking into the sun without sunglasses were more likely to express anger than people who had the sun behind them, or who were wearing sunglasses and walking into the sun.