A Plague of Lighthouse Keepers: "A Plague of Lighthouse Keepers" is a track from the English band Van der Graaf Generator's fourth album Pawn Hearts (1971). It is a concept piece over 23 minutes long, which comprises the whole B-side of the album.Metallosis: Metallosis is the putative medical condition involving deposition and build-up of metal debris in the soft tissues of the body.Robot-assisted double heart valve replacement: The first robotic-assisted double heart valve replacement was carried out in the Chennai region of India at Chettinad Hospital. Considered a rare form of surgery, this is the first instance of such a procedure using robotic surgery.Utkal Prantiya Marwari Yuva ManchPhotovoltaic retinal prosthesis: Photovoltaic retinal prosthesis is a technology for restoring sight to blind patients suffering from degenerative retinal diseases. In retinal degenerative diseases such as Retinitis Pigmentosa and Age-Related Macular Degeneration, patients loss ‘image capturing’ photo-receptors, but, neurons in the ‘image-processing’ inner retinal layers are relatively well preserved.Running room (dentistry): In implant dentistry, running room refers to the apico-coronal distance between the platform of a dental implant and the gingival margin. It is a critical factor in restorative implant dentistry because it is effectively the "vertical distance [available subgingivaly] to make a transition from the smaller diameter prosthetic platform of an implant to the larger cross-sectional cervical shape of the tooth being restored.Kurt KossmannOpacifier: An opacifier is a substance added to a material in order to make the ensuing system opaque. An example of a chemical opacifier is titanium dioxide (TiO2), which is used to opacify ceramic glazesTin Oxide ( SnO2 ) Stannic Oxide – Properties and Applications, The A to Z of Materials.John C. Snidecor: John Clifton Snidecor (October 18, 1907 - December 14, 1983) was an American professor and educator. He joined the faculty at Santa Barbara College of the University of California (now UCSB) in 1940 and served as acting provost of from February to June 1956.Joint replacement