Welsbach, Baron Carl Auer von (1858-1929), an Austrian chemist. During the 1880's in the laboratory of Robert Wilhelm Bunsen, inventor of the Bunsen burner, he did research on rare-earth elements and their compounds. Von Welsbach noted that some of the compounds burned brilliantly, and he began to use them in gaslight appliances he invented, including the gas mantle. He discovered neodymium and praseodymium (1885), two of the rare-earth elements. In 1907, von Welsbach and G. Urbain (working independently) discovered lutetium and isolated ytterbium, two more rare-earth elements.
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Albert Einstein was a pretty smart guy. When you look up the word "genius" in the dictionary, so the saying goes, it's a pretty safe bet you'll see Einstein's mug. He introduced concepts that we're still figuring out how to explain.
The man immortalized on the left was behind the three laws of motion and the universal law of gravitation. He was also competitive, temperamental and fascinated with alchemy. How well do you know Newton?