What are the 4 major advances in technology?

Why you are generating ac not dc? What is made of softwood? HOW DO FILTERING CAPACITORS WORK? Some equilateral triangles are not isoscles? How big is ps2 emulator? Why the potentiometer be considered as a voltmeter with an infinite resistance? What are the disadvantages of continuity tester? What allows a new class to automatically pick up all the data and methods of an existing class? Can somebody gives you code for instruction decoder in verilog hdl for RISC processor. also give you some links which are helpfuli need it for your final year project? What three factors determine the strength of a truss bridge? What materials are used to make cement? What is the term for machine thinking? What might the Mutation of a genetic material cause? What is a berimetric loop? What are the uses of semimetals? What are the best methods for constructing a retaining wall? What is liquid metal strain gauge? Are Malibu low voltage transformers AC or DC? What is it work AT AC PS PW? How was technology developed?