 This video features a material that is called 'magic sand' by the narrator of the video. Apparently it acts like normal beach sand until it comes into contact with water. The narrator states the 'magic sand' is hyrdrophobic which he states means that it minimizes it's surface area or some such when it comes into contact with water. Instead of dispursing and absorbing the water like normal sand when it's poured into the water it sticks togather and keeps the water out. When the narrator pours the water out of the glass again the sand is instantly dry.
Watch the video featuring the magic sand below or click over and view it on the host site. Source: Google Video | 
