[ahling]

Now obviously we all know that water is polar and oil is non-polar, but someone did a "magic trick" on me, and made sesame oil dissolve in water.

Does that mean the water is more alkaline than normal tap water?

Also, in general, is a solution more likely to be non-polar when it is basic? 

Thanks in advance!

[ARGOS++]

Dear ahling;

Increasing the alkalinity of water increases also its cleaning power, but for the “magic trick” you may study the following page:   

http://en.wikipedia.org/wiki/Surfactant

So you will also know how the “machine” cleans your clothes.

Good Luck!
                    ARGOS⁺⁺

[Missthelab]

I also think they "dosed" the water with a small amount of surfactant, which allowed the solubilization of the sesame oil via formation of micelles.