by Jane Leung
Was Mel Brooks' notion of selling air in his 1987 movie "Spaceballs" all that ridiculous?
Not if you look at some of the vacations on offer around the world today.
While not quite as simple as air in a can, tour agencies and holiday retreats are tapping a trend for back-to-basics R and R, where biology is turned into the central premise of a break.
1. Laughter retreats
It's been scientifically proven that a burst of face-aching laughter can lower stress levels, which is why there are workshops dedicated to learning to laugh even when there's nothing funny going on.
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