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I run forever, With a roarin...

I run forever, With a roaring call. Yet I have no throat, Or any legs at all. Rock wears away, Whilst I grow. You try to race me, And receive a blow. What am I?

Correct answers: 36

The first user who solved this task is Manguexa Wagle.

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The Sklar Brothers: Aggressive Advertising

Jason Sklar: It was the most aggressive advertisement weve ever seen. It was a bus bench ad advertising bus bench ads.

Randy Sklar: It was like the M.C. Escher of advertising

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Flotation process patent

In 1898, English brothers Alexander and Francis El applied for a British patent (No. 21,948) for their flotation process to separate valuable ore, such as copper, from the gangue (worthless rock) with which it is associated when mined. It was the first practical equipment to extract metals from low-content ore. Pulverized ore is mixed with water and brought into contact with thick oil. The oil entraps the metallic constituents, which are afterwards separated, and gangue passed away with the water. Today, flotation methods remain vital in the mining industry, processing millions of tons of ores each year.

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