Why does the shaving brush shrink when wet

Hii,
All the boys out there,shaving fascinates us.Isn't it.We all grow up watching our father or elder brother doing shaving and wish for the day when we start shaving.
Ok so while shaving when we dip the brush into water it starts shrinking.But have you wondered ever why does it happen?Well it's simple.It is due to the surface tension of water.The topmost surface of water gets pulled inwards as there is no water above it.Due to this reason tension is created on the brush towards inside leading to shrinkage.It is the same reason why rain drops get flattened after landing.Now I hope this phenomenon is clear.
Thanks...

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