But he says understanding these differences can help discover how some complex processes on our own planet really work.

VOA: special.2009.12.30

But Professor Rosen says the process is complex and may not work.

VOA: special.2009.06.09

The complex documents and mathematical work were no longer necessary.

VOA: special.2010.07.14

The space station complex will serve as observatory, laboratory and workshop for astronauts and cosmonauts who live and work there.

VOA: standard.2009.11.30