It's a win-win, and it's why everything on iStock is only available royalty-free — including all Bending images and footage. What kinds of royalty-free files are available on iStock? How can you use ...

It's a win-win, and it's why everything on iStock is only available royalty-free — including all Bending images and footage. What kinds of royalty-free files are available on iStock? How can you use ...

Knots have been a fixture for thousands of years. A recent database finds that many cultures share the same ones. Image credit: Shutterstock / UVgreen. The square, the sheet bend, and the overhand.