A leaf shaped flint tool usually interpreted as arrow heads. The macro photograph displays the multitude of strikes required to remove many tiny flakes of flint to create the tools shape and its ...

The cells that make up the walls of the finest of all lymphatic vessels have a lobate, oak leaf-like shape that makes them particularly resilient to changes in fluid volume. A similar cell shape ...

“It has been known for a long time that capillary lymphatic endothelial cells have a lobate shape, rather like oak leaves or jigsaw puzzle pieces. However, the reason for this unique morphology was ...

They cut through plant leaves with strong jaws, leaving behind circular-shaped cuts. These bees don’t take enough to hurt the plant, and their impact on its overall health is practically non ...