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Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. Why are zippers on different sides of male and ...

We’ve all seen the two-color sequin fabrics you can “draw” on by dragging your finger over so the pieces flip to the other color. It’s fun stuff to play with, and very popular with the kids right now, ...