What the flux does, when you heat a workpiece, is it reacts with these metal oxides that are forming with the temperature and exposure to the air, that tend to interfere with the metal-forming process of soldering.
What the Olympic medals mean... it was the best of times, it was the worst of times. It was the best of times, it was the worst of times definition. The opening sentence of A Tale of Two Cities, by Charles Dickens, referring to the time of the French Revolution. Discover our greatest slideshows.
Here's a look at how TIME covered six of the worst crises to hit the United States in the last century, at the moments when things looked their bleakest: 1  Oct. 29, 1929: Workers flood the streets in a panic following the Black Tuesday stock market crash on Wall Street, New York City. Hulton Archive / Getty Images.