First law: A body remains at rest only as long as is necessary to recharge batteries; or continues to move at a constant velocity so long as that velocity is enjoyable; and will only start or stop moving when acted on by a force, which is often the internal desire to go see something new.
Second law: The net desire to travel is equal to the rate of change of the passing scenery.The more scenery you see, the more you want to see.
Third law: When one body exerts a force which compels the body to travel, there is an equal and opposite force which compels the body to stay put. Luckily this force tends to only act up early in the mornings, and it easily overcome with coffee.
Wanderlust is like any other burning desire: it is a lawless, endless want that defies science, a thirst that demands to be slaked. Sometimes it is sated, and sometimes no matter what you do, you're still filled with an endless temptation to see more, do more, be more places and breathe more air. I don't get itchy feet: I get itchy legs, itchy lungs, itchy eyes and nose and ears.
Right now I am in an office job, tied to a 12-week internship I value hugely for the experience and yet cannot stand because of its restrictiveness. I'm spending my spare time learning Spanish, Japanese and French so I can get by in more countries the next time I have a chance to go.
Next summer, I have 12 weeks: I will spend them as far away as possible.