Solar panel is a generic term used to describe a device that collects and converts solar energy into electricity or heat. But what are these devices exactly and haw are they being made?

                                      

This video is for all of the audiophile newbies interested in knowing how a loudspeaker driver is built. This also gives a lot of insight as to how a driver works.

                                      

A compass is a navigational instrument for finding directions on the Earth. It consists of a magnetized pointer free to align itself accurately with Earth’s magnetic field, which is of great assistance in navigation. The face of the compass generally highlights the cardinal points of North, South, East and West.

                                      

Do you know how the push tube used for putting toothpaste in is actually being made?

                                      

A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, concentrating or diverging the beam. A simple lens is a lens consisting of a single optical element. A compound lens is an array of simple lenses (elements) with a common axis; the use of multiple elements allows more optical aberrations to be corrected than is possible with a single element.

                                      

And we tought that these are just some sort of accessory they are wearing.