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The harder and flatter the surface, the better it reflects the original sound wave, the rougher the surface the more it scatters the sound. This is why the insides of these CUCV trucks without the sound treatment of carpet, padding and headliners makes for a good echo chamber - and listening to...

Counter intuitively, bright white is the best color to use inside a lightbox. Silver or chrome results in a specular reflection, rather than a diffuse reflection, which can lead to hot-spotting (some areas will appear brighter than others). Also a flat paint is better for even scattering than...

Get a HAM license, and a OpenWRT WiFi access point and you can "roll your own" OnStar-type system. Plug in a separate WiFi card to the OpenWRT access point and it can be programmed to find any open hotspot and connect (and agree to the terms of service automatically), then a cellular data modem...