This summer I traveled to Europe. In the heat of airport queues and non-air-conditioned rooms, one tiny product made a huge difference to my comfort. It was a USB-powered fan from Xiaomi, known simply as the Mi USB Fan. Together with a

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This summer I traveled to Europe. In the heat of airport queues and non-air-conditioned rooms, one tiny product made a huge difference to my comfort. It was a USB-powered fan from Xiaomi, known simply as the Mi USB Fan. Together with a