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SMILE is an online collection of math and science activities available to anyone, free of charge. We are also a community of educators who contribute, use, and comment on activities at howtosmile.org. SMILE stands for Science and Math Informal Learning Educators; we are a pathway (an audience-specific branch) of the National Science Digital Library (NSDL.org).

SMILE spotlights hands-on and interactive activities, both physical and virtual, that involve doing and learning.

Activities take many forms, from downloadable lesson plans to how-to videos to online interactive games.

The Boolify Project provides a jigsaw-like template into which you can drag the search modifier pieces "and," "or," and "not." Each time a piece is added to the puzzle the search results at the bottom of the page will change accordingly.

The Boolify Project is a good resource for helping students understand how search operator words can affect their search results. In addition to the search tool, the Boolify Project offers a small collection of lesson plans for teaching about web search tactics