It's hard to watch those ubiquitous YouTube Web clips: They arrive as streaming video directly from the Web and aren't downloadable.

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Also, since radio waves sometimes arrive at your device not directly from the radio tower but rather by being bounced off a building or hill, these signals may be much lower in signal strength than if you had a clear line of sight view to the cell site.

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Cherenkov telescopes such as the Hess array in Namibia or the Magic facility in the Canary Islands catch this process directly from the atmosphere when the particles first arrive at Earth.

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Not so with cars ordered directly from Avtovaz or from independent dealers, which often arrive with windshields smashed, wiring pulled out or tires slashed.

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