A useful comparison is the Bohr model of the hydrogen atom, which was considered implausible from its inception, even by its creator, yet led the way to the ultimately correct theory of quantum mechanics.
Alternatively, one useful simplification of the metabolic modelling problem is to ignore the underlying enzyme kinetics and only rely on information about the reaction network's stoichiometry, a technique called flux balance analysis.
In military usage, a gun is a cannon with a high muzzle velocity and a flat trajectory, useful for hitting the sides of targets such as walls, as opposed to howitzers or mortars, which have lower muzzle velocities, and fire indirectly, lobbing shells up and over obstacles to hit the target from above.
Legendary material, such as that in hagiography or later medieval sources such as John of Fordun or Andrew of Wyntoun, is not generally regarded as useful beyond its limited potential for cleanly preserving earlier source material.
Neutron penetration into materials makes californium useful in detection instruments such as fuel rod scanners; neutron radiography of aircraft and weapons components to detect corrosion, bad welds, cracks and trapped moisture; and in portable metal detectors.