Gifted&
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Mathematics

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First few digits of e:

2.7182818284 5904523536 0287471352 6624977572 4709369995 9574966967 6277240766 303535475 9457138217 8525166427 4274663919 3200305992 1817413596 6290435729 0033429526 0595630738 1323286279 4349076323 3829880753 1952510190 1157383418 7930702154 0891499348 8416750924 4761460668 0822648001 6847741185 3742345442 4371075390 7774499206 9551702761 8386062613 3138458300 0752044933 8265602976 0673711320 0709328709 1274437470 4723069697 7209310141 6928368190 2551510865 7463772111 2523897844 2505695369 6770785449 9699679468 6445490598 7931636889 2300987931 2773617821 5424999229 5763514822 0826989519 3668033182 5288693984 9646510582 0939239829 4887933203 6250944311 7301238197 0684161403 970198376 7932068328 2376464804 2953118023 2878250981 9455815301 7567173613

"We have to reinvent the wheel every once in a while, not because we need a lot of wheels, but because we need a lot of inventors."
~ Bruce Joyce

Mathematical Tools

GeoGebra
GeoGebra is free educational dynamic mathematics software that joins geometry, algebra and calculus.  It can be run directly in a web browser, or downloaded and installed on your computer.
Wolfram Demonstrations Project
Wolfram Demonstrations Project offers a collection of more than 5,000 interactive visualizations for a wide variety of mathematical topics.
FooPlot
FooPlot is an online graphing calculator that allows you to plot up to five equations (function, polar, or parametric) simultaneously, then save your graph as an image file.
CodeCogs Equation Editor
CodeCogs Equation Editor let's you write and download equations in seconds! An excellent resource for publishing math equations on the web.
Graph Paper
Free Online Graph Paper offers PDFs of various types of graph paper including square, triangular, hexagonal, circular, polar, and many more.

Presentation Tools

SpicyNodes allows you present information in the form of nodemaps (similar to mindmaps). Great for showing both detailed relationships as well as a complete overview.
Prezi is a cloud-based presentation software with a zoomable canvas. Text, images, videos, and other objects are placed on an infinite canvas and grouped together in frames.