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The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, [ 1] that the earliest photosynthetic life forms of Early Earth were based on the simpler molecule retinal rather than the more complex porphyrin -based chlorophyll, making the surface biosphere appear purplish ...
Iridium is a chemical element; it has symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56 g/cm 3 (0.815 lb/cu in) [ 8] as defined by experimental X-ray crystallography. [ a] 191 Ir and 193 ...
Gold often occurs in free elemental ( native state ), as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as in electrum ), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite.
Auto repair costs, while up 3.4% compared to a year ago, have cooled significantly from last July when they were rising at a 12.7% rate annually, according to CPI data. With both those costs ...
"Information wants to be free" is an expression that means either that all people should be able to access information freely, or that information (formulated as an actor) naturally strives to become as freely available among people as possible. It is often used by technology activists to criticize laws that limit transparency and general ...
Painting a fence post purple sends a clear message to keep out of a property without relying on the actual words. Unlike a sign that can become stolen or unreadable over time, the purple paint ...
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