A great resource to find and tune into many web based SDR receivers. Filter by band, region, tune up and down the bands, adjust your bandwidth, record audio, view full waterfall and a lot more. It is quite amazing really.
A great ham radio and Raspberry Pi forum website
A great video on the history of transistors, how they work, what they replaced and how they have truly changed the world. We are now reaching the point of prediction where in order to maintain or even continue increases in speed a successor to the transistor must be ‘invented’, quantum mechanics?