Extra Credit

Stargazing for aliens

作者：BY KEVIN DELANEY, THE NEW YORK TIMES

Gregarious by nature, humans hate to feel left out. And if there’s a party going on somewhere, anywhere, even light years away, we would prefer to know about it. 

点击阅读全文

对本期电子报订户、有效期内的VIP教师会员和本学期二十一世纪英文报尊享卡用户，我们开放所有内容：
如果您拥有以上权限，请点这里登录；
订阅电子报，请点这里；
激活VIP教师卡，请点这里；
激活21英语尊享卡，请点这里。