1 A method for error correction in integegrated circuit (IC) implementations of Boolean functions is described. Additional logic, implementing error correcting codes known from channel coding, corrects both ’hard’ manufacturing errors and ’soft’ temporary errors. Experimental results are presented, with code optimization based on a fast algorithm for Boolean symmetry analysis. Apart from the we...

Preaxial polydactyly is the most common duplication pattern in white and Asian populations (1). It is a congenital anomaly with a wide range of manifestations. Current classification do not have the capacity to classify all different types of radial polydactyly. We describe here a very rare and unusual case of bilateral preaxial polydactyly (triplication) in a woman and report the operations re...

Duplication of the mitral valve is a rare congenital cardiac anomaly, only twenty instances having been previously reported. There are on record in addition two cases of triplication of the mitral valve, a condition presumably resulting from a similar defect in development. Duplication of the tricuspid valve also occurs, but less commonly than the mitral anomaly. This case is reported in order ...

Seismic waves that traverse Earth's inner core along north-south paths produce unusually broad pulse shapes at long periods (compared with waves along east-west paths) and reflections from below the inner core boundary at short periods. The observations provide compelling evidence for a seismic velocity discontinuity along north-south paths about 200 kilometers below the inner core boundary sep...