2c) from the Hell Creek Formation have the same structure. Under PLM, individual lamellae in both primary and secondary (replacement) osteons (cylinders of bone deposited around vascular canals ...

The new concrete, which is full of hollowed-out shapes, was inspired by the cortical bone structure of the human ...

Those arrays criss-cross and finally radiate outward to build concentric cylinders called osteons---which combine with interconnected canals to make the smooth, white layer of bone. That's a lot ...