Holiday Gift Guides!

First, for math geeks:



http://ift.tt/1v1toFk



want to get me a prezzie? go for this!

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A crochet kit and Crocheting Adventures with Hyperbolic Planes by Daina Taimina. You know the mathematician in your life wants to make some negatively curved objects out of yarn!

I've been meaning to get this:

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A Klein Bottle opener by Bathsheba Grossman. (Note that it only opens orientable bottles, so unfortunately you can’t open a Klein bottle with a Klein bottle opener.) Klein bottles can also be obtained in glass or wool from kleinbottle.com.

Holiday Gift Guides!