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Don’t put any coins in this cardboard coin box. How to make a coin sorting machine with cardboard With some thick cardboard, a cutting knife, some hot glue, a ruler, and probably a bit of trial and error, you can create your own DIY coin sorting machine. The key to the sorting "mechanism" is to cut the right size ... Can you solve the counterfeit coin riddle? You're currently locked in the dungeon by orders of the king, but as the realm’s greatest mathematician, you've been given a chance to free yourself: If you can identify a counterfeit coin, one fake coin in a group of...

Crafting Cell Diagrams Create your own cells with science enthusiast and STEM education advocate Ella K. How to Understand Power – TED Ed Every day, we move and operate within systems of power that other people have constructed. How to fold a Christmas Tree Napkin – Instructables If you're looking for a few modern, evergreen-themed decoration ideas for the holidays, check out this easy yet impressive-looking Christmas Tree Napkin Fold from Instructables. Reinventing the Wheel (for Mars) Google : Online checkout in real life.