原视频：Loneliness（Kurzgesagt – In a Nutshell）
难度：高级；分类：知识与科普；时长：13:06；标签：讲解、旁白、心理
Kurzgesagt 科普动画，从进化生物学解释孤独感从何而来、为何会形成恶性循环以及如何走出来，信息密度高、用词偏学术，适合高级学习者。
视频探讨孤独感的生物学本质、现代社会孤独 epidemic 的成因及其危害，并提供识别和打破慢性孤独恶性循环的实用方法。
this occasional feeling has become chronic for millions.
and yet, an unprecedented number of us feel isolated.
and yet, an unprecedented number of us feel isolated.
Loneliness is a purely subjective, individual experience.
A common stereotype is that loneliness only happens to people who don't know how to talk to people,
because it's part of your biology.
Natural selection rewarded our ancestors for collaboration,
Natural selection rewarded our ancestors for collaboration,