There seems to be a lot of debate on the authenticity of this video:

http://www.youtube.com/watch?v=vCeAfKCC2ng

Briefly, the video shows how you can make a liquid that when exposed to air, creates small ball shapes.

Those that claim that it's fake say he's just using clear marbles.

It's fake. The liquid at the end has the same refractive index as the glass marbles inside the liquid, making the marbles "invisible". The trick is often done in introductory chemistry classes -- a glass test tube is "hidden" inside a beaker full of liquid with the same refractive index as pyrex glass. Turpentine, glycerine, and orange oil all have a refractive index very close to that of pyrex glass, for example.

Here is a nice list of refractive indexes that includes a lot of types of glass and a lot of liquids. Note that refractive index of a liquid can be tweaked a little by heating or cooling it.

The list:

http://www.robinwood.com/Catal...actionIndexList.html