It elevates your mood. Smiling has numerous physical and psychological benefits, including relieving stress, lowering your blood pressure, and boosting your immune system.
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Interruptions can be frustrating. But, the point here is that not all of them are worthy of addressing.
Sometimes, the best thing you can do when faced with an interruption is nothing at all, particularly if it happens just once or very infrequently.
The ‘miserable smile’ is a stoical grin-and-bear-it expression – a slight, asymmetric smile with an expression of deep sadness pasted over the top.
Since Landis’ classic study, psychologists have found this tell-tale smirk on the faces those watching gory films – they were filmed by a hidden camera – and among patients suffering from depression. It's a socially acceptable way of showing that you’re sad or in pain.