Interactive Mathematics Miscellany and Puzzles

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Important note:

On many pages, some words or phrases are omitted and empty space they occupied is underlined like in this,there,at home,here,this,in school,mathematicsexample. On such occasions, when the cursor hovers over the omission, a menu is displayed forcing you to make a choice. Your selection then appears in the previously empty space. This technique has been long used in the Outline Mathematics,Outline Mathematics,White House,National Science Foundationpages with the help of Java applets. The latest implementation is quite different and is much easier to use. Observe that the intended selection appears on a different background or in a different typeset. So do not be surprised.