# Spreadsheet (Excel, etc.)

### Switching Light Bulbs

Can you see the light? That is, can you see the patterns in light bulbs that are left on, after repeatedly following a simple rule to switch them on and off?

06/02/2017 - 07:25

### Boomerang Fractions

Explore the surprising variations in conceptually simple sequences of numbers, constructed by applying one of two operations to generate each successive term. Can you make the sequence return to its starting value?

06/02/2017 - 07:03