Sometimes, we create our own graphics when we believe that we can help our readers understand the concept better using a custom image.

We put a lot of effort into creating these images and we do not appreciate people stealing our work. We do not allow images to be downloaded and re-uploaded to any website, whether for personal or commercial use, regardless of for-profit or non-profit. The only case we allow use and or re-uploading of our images is when direct permission is given from us to you to use out images.