Yet except for icons like Vegemite (the high-vitamin yeast spread) and koalas, most Americans--including investors--know little about Oz.

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Although yeast is a simple organism, its molecular biology is a lot more mammal-like than a bacterium's.

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Waffles, like their doughnut cousins, tend to fall into two camps: cake and yeast-raised, the former sporting a firmer crumb, the latter, a lighter center and crisper ridges.

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