We can all agree that robots are awesome, but building them can be a daunting task. Check out this simple origami robot made from a vibration motor, business card, 3v cell battery, and tape. It is so easy it practically builds itself.
Long before written numbers existed, the Abacus was invented to help merchants count and calculate the cost of goods. If you need to count large quantities (higher than 10 fingers), try making an Abacus out of a shoebox, BBQ skewers, and two different colored beads. It is the world’s first tablet!