This simple combination lock accommodates codes from 1-9 digits long, with the only restriction being that the same digit cannot be used twice. The circuit shows strapping for a 4-digit code, in this ...

Create circuits from scratch and move around a wide selection of components any way you want with the Simple Electrical Circuits in Series, Parallel and Combination app by Exploriments. You'll have ...

A simple combination of molecules converts cells neighboring damaged neurons into functional new neurons, which could potentially be used to treat stroke, Alzheimer's disease, and brain injuries. A ...