We think a good primer is this multi-layer PCB layout guide which [Rik te Winkel] recently put together. It’s one of the results of his internship experience. One of the major differences with ...

The four-layer diode was the key to William Shockley's plan to revolutionize AT&T's phone system. It was a great device in theory, but not in practice -- at least not at the time when Shockley ...

Let me tell you, I have seen a lot of facials for this job, but this one is four layers of seaweed products applied all at once on top of the face. It's supposed to be really great for toning ...