The charts and diagrams on this site are drawn here, from the primary sources named in each one. They are not stock images and they do not exist anywhere else.
You may republish them. On a blog, in a newsletter, in a video, in a lesson, in a book, commercially or not.
The one condition
Credit visibly, and make the credit a working link to the article the chart came from. Not to the home page — to the article, because that is where the working is shown.
Something like: Chart: Ancient Biotechnology, with the words linked.
What this does not cover
Photographs and paintings. Most of those come from Wikimedia Commons under licences held by their photographers or museums, and are credited individually in their captions. This site cannot grant permission it does not hold — for those, follow the licence in the caption.
If you want the source
Every chart states the studies it is built from in its own footer. If you want a figure at a different size, in a different language, or with the underlying numbers, ask through the contact page and it will be sent.