Found at the thrift store: hot or cold? Infinitesimal?

Yesterday's thrift store shift was mostly about digging through the backlog of children's books.  Plus keeping up with the usual incoming boxes of everything under the sun (in the book corner, I mean).

This is a fun one I put out for sale (but didn't buy):

I had never seen one of these touch-and-feel art board books, but there's a whole series of them.  Wow, what will they think of next?

A picture book about Mary Anning: I brought this home for Crayons/Dollygirl.

Cool It: The Skeptical Environmentalist's Guide to Global Warming, by Bjorn Lomborg. I thought this would interest the scientists in the treehouse.

The Hot Topic: What We Can Do About Global Warming, by Gabrielle Walker and Sir David King.  Considering there's an endorsement on the front cover from David Suzuki, this is obviously written from the more PC point of view.  But still interesting.

What's Mama Squirrel reading?  She is working very hard at one of the books we found last week:

(Even arts majors should know something about how the universe works, right?)