Spooky Spice!

A filled a bowl with water and sprinkled pepper on the top! Then she dipped her finger into the centre of the bowl. Alacazam! The pepper moves to the side of the bowl when A puts her finger in.....why???????

A. secretly has a little soap on her finger! The water molecules stick together until the soap breaks the bond. Then the water molecules on the side pull harder, taking the pepper along!