Just as our visual system strains to see the vase and the two faces at once, we struggle to conceive of a motion that has a dual motivation: to put and to fetch. A paper by Van de Cruys, Wagemans and ...
Interactive books and kits provide hands-on fun and learning for kids. The Little Box of Magic Tricks: Over 80 Tricks to Amaze Your Friends! by Janet Sacks includes eight mini-books plus assorted ...
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