But given the fact that the Paperwhite has a higher resolution than its closest competitor (the GlowLight) and the newer technology means a generally smoother light distribution, the text is sharper and easier-to-read than on any other Kindle.

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The first images from space of the distribution of light sources on the planet's surface were published in 1989.

ECONOMIST: Going, going, nearly gone

Individuals who purchase the LuminAID light will be helping the distribution of the product around the world.

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This sampling helped to work out the distribution and mix of light wavelengths and their relative intensities found in a scene, said Mr Hunt.

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Looking at the Nook for a second, you can immediately isolate the top as the light source, with a stronger concentration and somewhat even distribution.

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Yet Mr Kay sheds no light on whether more competition should be encouraged in the distribution of health care, say, or water supplies, or whether raising or lowering taxes improves economic growth.

ECONOMIST: Capitalism's success

Tony Tyson and David Wittman, who work at Lucent Technologies' Bell Laboratories, in New Jersey, and their collaborators have proposed building a telescope that estimates the distribution of mass in the past by analysing these deflected light-waves, a technique known as three-dimensional mass tomography.

ECONOMIST: Cosmology

Until last summer, advertising any alcohol other than light beer was strictly prohibited in Utah, one of 18 states that control the distribution and price of liquor.

ECONOMIST: Religion and advertising

Quantum key distribution does this by encoding the information in the polarisation states of individual photons, the particles of light, which are sent from Alice to Bob over an optical fibre.

ECONOMIST: Secure cryptography is only as safe as its weakest link