Ask a Physicist: FTL Communication With a Very Long Stick

Amy from Hull, England asks:"Imagine a tube structure stretching a large distance (say a light year) encasing a row of ballbearings that are lined up inside the full length of the tube. If I push one more ballbearing in from one end, would a ballbearing at the far end instantaneously drop out? Or for millions of years until the information is transferred would there be more ball bearings than the tube would normally fit? Or would it simply take me millions of years to push an extra ballbearing i...