Prowess Amplifiers offers resources for the guitar tube amplifier builder. We have a huge schematics inventory, projects section and forum.

http://www.prowessamplifiers.com/      (popularity:  ; clicks: 0; comments: 0)      

This webpage dedicated to biography of two famous astrologists and excellent scientists Galileo Gallilei and Johannes Kelper.

http://www.galgaleo.org/      (popularity:  ; clicks: 0; comments: 0)      

Semiconductors: physics, manufactoring, devices

http://www.semiconductorsinfo.net/      (popularity:  ; clicks: 0; comments: 0)      

Introduction to thermodynamics, description of its laws and processes

http://www.termodynamics.com/      (popularity:  ; clicks: 0; comments: 0)