These are some of the first Lego sets to be shot into space.  In fact they are orbiting right now with an astronaut playing with them.

It's all in the name of science and teaching kids how things work in space.  Participants in the program have matching Lego sets and assemble theirs in concert with an astronaut.

Nifty enough the astronaut will assemble their sets in a glove box so no parts go astray in the ISS.

I'm not sure of the science but for the kids it has to be a building experience.

For more see this source article.