The elastic round ruber

[Jraou]

Hey
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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.
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Thanks in Advance

[Mister Micawber]

.
1-- a squeeze ball? a tension squeezer?
2-- Library Science?
.
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Native English teacher at Mister Micawber's

[Jraou]

Thanks so much Mister Micawber! :D