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美国一名海军陆战队成员，日前在社交网分享了一个奇怪的小发现︰原来人们可以在手腕不动的情况下，将朝上的掌心转至朝下。

他上传示范片段引起广泛回响，有网民如梦初醒直呼︰“这是我今天学到最重要的事。”

海军陆战队员德兰（Jayson Deland）身穿军服站在镜子前，左手拿着手机自拍示范。片中清楚可见，他向前伸直的右手掌心向上，然后屈曲前臂、再九十度角转移回前方。动作重复两次后，德兰的手腕明明纹丝不动，原本向下的手掌却已反转成手掌心朝下。

不少摸不着头脑的网民忍不住跟着短片试做，才发现原来只要像德兰般转动手肘关节，根本不需要动到手腕，完成这个小挑战也是“易如反掌”。片段至今已有逾一百四十万人观看，逾万网民模仿拍摄放上网。