Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
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“When I was a teenager, cricket in Zimbabwe was almost exclusively played and supported by white people,” he says. “Besides the accents and topics of conversation, you could tell this by the way they would applaud and chant. It had a particular energy. The most animated fans were usually the ones who had too much beer and hurled abuse at the players on the boundary.”