When he took up diffusion problems, he began to develop his own apparatus, and whether it was from inborn ingenuity or merely from a fury of labor, he was so competent that he won from Terry the almost overwhelming praise: "Why, that’s not so darn’ bad, Slim!" The sureness to which Max Gottlieb seems to have been born came to Martin slowly, after many stumblings, but it came.
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When the United States focused on terrorism, the movement went further underground and became more diffuse.