However, Koch never credited the Hesses for their discovery of bacteriological agar, perhaps because, at the time, he failed to recognize its importance. Even after he received the insight about agar from the Hesses, Koch stuck with gelatine for years. In 1883-84, during his first medical expedition to Egypt and India to investigate cholera, he tried and failed to grow the cholera bacterium on gelatine media in the hot climate of Cairo (despite using a half-open fridge for incubation), only succeeding in the colder winter of Calcutta.
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这个被置换而来的孩子，日后人生轨迹被更大的历史力量再次扭转。越南统一前，杜耀豪的外祖母在越南已建立起中产之家，生活优渥。她惦念着留在家乡刚成年的弟弟，计划将他接到越南，帮他改善生活。然而，1949年的政局剧变，隔断了姐弟团聚的迁移计划。