But many of my calls had some slight echo effect or occasional clipped words, despite a recent software update intended to fix the problem.

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The only way to avoid this kind of echo chamber effect is to make a habit of consuming media from a wide variety of ideological perspectives.

FORBES: Decentralized Media Industry Places New Demands on Readers

Dana Milbank chimed in to argue that the rise of Twitter had created an echo chamber effect among campaign journalists that shapes these shared narratives, literally moment-by-moment.

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It's what we call a light echo, an effect that we've seen around supernovas - stars that explode - and because of the vast scales involved, the speed of light is actually very slow.

NPR: What Makes Our Solar System Special?

In an echo of the debate over climate change the US is sceptical about the effect of G8 timber policies because China is a huge importer of stolen timber.

BBC: NEWS | Programmes | Newsnight | US blocks forest protection plan