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In organic chemistry, an alkane, or paraffin (a still-used historical name that also has other meanings), is a saturated hydrocarbon. Alkanes consist only of hydrogen and carbon atoms and all bonds ar ...
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August Kopff (February 5, 1882?April 25, 1960) was a German astronomer who discovered several comets and asteroids. He studied and worked in Heidelberg, getting his PhD there in 1906 and he then joine ...
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An electric current is a flow of electric charge. Electric charge flows when there is voltage present across a conductor. In electric circuits this charge is often carried by moving electrons in a wir ...
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In soil science, humus refers to any organic matter that has reached a point of stability, where it will break down no further and might, if conditions do not change, remain as it is for centuries, if ...
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