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Crossing Every Bridge Exactly Once (aka Eulerian Paths)

How can you cross each bridge in this city exactly once?

Path Cipher (Codes Part 4)

Now let’s try the Path Cipher – a cipher that mixes things up even more than Zig Zag did.

Zig Zag Cipher (Codes Part 3)

Let’s try a cipher that doesn’t substitute new letters or shapes. We just mix things up.

Pig Pen Cipher (Codes Part 2)

Let’s encode some secret messages with a cipher that was actually used during the American Civil War!

Shift Cipher (Codes Part 1)

Let’s encode and decode secret messages like Julius Caesar!

Fractals: Sierpinski’s Triangle

What if this triangle pattern just kept repeating… forever!?

Fractals: Koch Snowflake

You could keep zooming in on this snowflake forever!

Engineering: Build A Bridge

Using real bridges as their starting point, students will construct bridges out of straws and paperclips.