The elastic round ruber


Could you please help me figuring out the single vocabularies standing for the following definitions?

  1. The round ruber that can help you get your wrist strong;
  2. The major in which one studies how to keep books at a library.

Thanks in Advance

1-- a squeeze ball? a tension squeezer?
2-- Library Science?

Thanks so much Mister Micawber! :smiley: