【2021-12-29】
法国 Cosquer 洞穴里 27000年前格拉维特人留下的手印，这种手印在更新世南欧洞穴中很常见，是用含在嘴里的颜料喷出来的，特别的是，其中不少手印缺了几个指节，以前有人认为这是某种符号象征，后来有人分析了缺节的分布情况（图3），发现缺节频率从小指、无名指、中指、食指依次递减，前两种占了绝大多数，而拇指频率为0，这一频率分布与现实中因冻伤而导致手指缺节的情况基本吻合，（见 Ian Gilligan (2018) Climate, Clothing, and Agriculture in Prehistory，ch.6）
@睡不着的红猴子:是因为一般情况下小手指在身体最外侧吗？还是因为血管分布什么的？
@whigzhou: 嗯，外侧和离主要动脉的距离可能都有关系，还有粗细，越细越容易冻伤
@whigzhou: 据说高纬度男人的阴茎比热带略短，也是同理，阴茎很容易冻伤，所以遇冷会缩成小瓶盖
@whigzhou: 友情提示：冬天户外跑步的男人要特别小心这个问题，要加一层保暖，鸡鸡冻掉就麻烦了（或者说免了很多麻烦了）
@whigzhou: 这里说的纬度，当然不是指你当前生活的纬度，得往回推小几万年，比如Mongoloids，祖上是寒带的，所以继承了大量寒带特征：扁平脸，眯缝眼，短小腿，干耳屎，较不发达的大汗腺……都是对严寒的适应
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