杜耀豪的母亲生于越南，对母系的根源知之甚少，而这一次通话，仿佛是她迟到了数十年的、对母亲历史的追寻。杜耀豪的旅程，因此不仅关乎自己，也激活了母亲那一代人沉睡的记忆。
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The British weren’t alone in their hunt. Chileans, New Zealanders, and South Africans, among others, were also scrambling to source this strategic substance. A few months after the Pearl Harbor attack, the U.S. War Production Board restricted American civilian use of agar in jellies, desserts, and laxatives so that the military could source a larger supply; it considered agar a “critical war material” alongside copper, nickel, and rubber.1 Only Nazi Germany could rest easy, relying on stocks from its ally Japan, where agar seaweed grew in abundance, shipped through the Indian Ocean by submarine.2