The finely powdered ore is added to water in a tank containing pine oil. The mixture is agitated by blowing a blast of air. The ore particle preferentially wetted by oil come to the surface with froth...
Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young.
The greatest thing in life is to keep your mind young. - Henry Ford
Learning is beautiful,...
This is one of my videos of word problems of quadratic equations.
There are more of them, one can go through and get an idea of the topic quadratic equations