But according to two US-based scientists, the owl has some very smart bone and vascular structures running along its neck to the skull.

BBC: How owls swivel their heads

Because most businesses have trimmed their expense structures to the bone, any revenue growth has an out-sized effect on profits.

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The company's femur implant is dense where stiffness and strength is required, but it also has strong lattice structures which would encourage the growth of bone onto the implant.

ECONOMIST: 3D printing