The String and Paper Centrifuge This toy-inspired centrifuge could enable medical testing in remote locations, and costs just 20 cents to make.

Before the wide use of paper sacks, no matter where you shopped your purchase would be wrapped with brown paper and tied up with a string in a neat package, easy to carry.

Change a few sheets of paper into a practical A4 file folder with this easy DIY project! Perfect for organizing papers, assignments, or important documents, this homemade file folder is simple to ...