The elastic round ruber

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hey

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

2

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

3

Thanks so much Mister Micawber! :smiley: