Stop water boiling over

A while ago I saw a great tip on pinterest but I cant find the source now. 
Basically when cooking anything with water; ie rice, potatoes, pasta, etc
put two chops sticks (or a wooden spoon) on the pot,
This will stop the water from boiling over.
No more mess to clean up.
I have no idea how or why this works but it does.  
Anyone tried this?
Madeleine  x
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