mastering the best paper airplane designs. Krstic’s hobby would eventually culminate in becoming the 2022 Red Bull Paper Wings champion (yes, there is such a thing) with one of his latest models ...

2. Fold and remove the rectangular flap with the instructions on, along the red line labelled ‘2’. 3. Place the paper design face down and fold the large triangle in half along the blue line labelled ...

Red and blue fibers have been a longtime ingredient of U.S. currency paper. Special features like these fibers are embedded in currency paper to ensure that reproduction is difficult. While some ...