What Am I

I flow like the river and fall like a spring Dazzling many like a pugilist on a ring, Interact with many people and classes, Making young men to raise their glasses. Racism and apartheid are not in my book, Even though I`m finer than a brook, Making beautiful girls to dance like stars, And dealers and entertainers ride in posh cars. I make sorrow varnish like faint smile Making sportmen to go the extra mile, Causing the rise and fall of thermometers, Brains beclouded for moving on few meters. To help men solve their problems this I crave, Yet I`ve led many into crime and the grave, Scientists plan to wed me with gasoline, Which makes me better than formalin. So,what am I?