This library guide is a collection of interactive widgets on a variety of scientific subjects.

This page offers mathematics resources, including:

**PlanetCalc: Combinations Generator**

**TedEd: How the Königsberg bridge problem changed mathematics**

- Graph EditorUse the Graph Editor to create undirected and directed graphs and trees. Can download as a PNG file or generate markup.

- Combinations GeneratorFind all possible combinations (without repetition) for set of elements. You provide the elements and combination size.

- Pixar in a Box: Building CrowdsLearn how combinatorics was used to create crowds of robots in the Pixar film WALL-E

- PhET Simulations: MathMath simulations on quadrilateral, calculus grapher, numbers, waves, ratio and proportions, number line, vectors, fractions, and more!

- CS Academy: Geometry WidgetUse this tool to manipulate objects (e.g. points, segments, polygons, circles) on a plane.
- CS Academy: Diff ToolA tool for noticing the difference between two workspaces.
- CS Academy: WorkspaceA workspace for various computer languages. Select the one you want to work with from the dropdown menu.