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21.01.2017, 08:58 - nieeshoes - Rank 6 - 1159 Posts
A late arrival for platinum and gold? By Jessica Gorman ,
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, 15:47 PM April 15, 2008 For decades, geologists have wondered why Earth's mantle, between the planet's crust and core, contains as much platinum, gold, and certain other elements as it does. New research suggests that this mysterious overabundance may be due to alien invasions. These substances are siderophilic, or iron-loving. During Earth's early formation, they should have been much more attracted to the planet's iron core than to its mantle, which is dominated by silicates. The bulk of siderophiles do in fact re... Source URL:

Iridescent blue leaves on some begonias aren’t just for show — they help the plants harvest energy in low light,
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The begonias’ chloroplasts,
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, which use photosynthesis to convert light into fuel,
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, have a repeating structure that allows the plants to efficiently soak up light. This comes in handy for a plant that lives on the shady forest floor. The structure acts as a “photonic crystal” that preferentially reflects blue wavelengths of light and helps the plant better absorb reds and greens for energy production,
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, scientists report October 24 in Nature Plants,
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Colors in plants and animals typically come from pigments,
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, chemicals that absorb certain wavelengths,
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, or colors, of light. In rare cases, plants and animals derive their hues from microstructures. In?begonias, such tiny, regular architectures can be found within certain chloroplasts, known as iridoplasts

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