For more information about my south pole adventures see: Follow Janice and Randy to the South Pole. photo credit: 阿拉斯加巴羅-鯨骨拱門-20130530-賴鵬智攝-1 via photopin (license) … [Read more...]
Rotation: Paper Helicopter
Things that rotate turn around a center point. Rotate means to turn around a fixed center point or axis; Two dimensional objects, such as the CD shown, rotate around a stationary center point; … [Read more...]