On May 19, 1908, Selfridge became the first US military officer to pilot a modern aircraft, when he flew solo in AEA's newest craft, White Wing. By doing so he became the first U.S. military officer to fly any airplane unaccompanied.
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暗物质搜寻实现近绝对零度：比外太空寒冷数百倍
西方担忧梅拉尼娅·特朗普处境08:51