https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13998801![A pine branch. Pencil drawing by S. Kawano.](https://images.rawpixel.com/image_social_square/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djcWRrYzltcXAtaW1hZ2UuanBn.jpg)
![A pine branch. Pencil drawing by S. Kawano.](https://images.rawpixel.com/image_social_square/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djcWRrYzltcXAtaW1hZ2UuanBn.jpg)
A pine branch. Pencil drawing by S. Kawano.
A pine branch. Pencil drawing by S. Kawano.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use