Is there a material which is so strong, you can’t break it at all?

Question: Is there a material which is so strong, you can't break it at all?
- Keywords:
  material
Asked by iluvnibbley456 to Ed, Hayley, Jason, Nathan, Sophie on 22 Mar 2013.
- Hayley Evers-King answered on 22 Mar 2013:
  
  Diamond is the hardest known substance, but we can use diamonds to break other diamonds! But they arent very useful as a building material. But new materials like graphene may prove to be the most strong useful substance for making things!

Question: Is there a material which is so strong, you can't break it at all?