近年来，美国一些公立学校给出了第三个选项。时报文章《Some Schools Allow Children to Register With a Gender Option Besides Girl or Boy》中提到： “Washington, D.C., schools are the latest, with a small change on the public school ...

JERUSALEM, Sept. 4 (Xinhua) -- A new study has found that most massive stars in the early universe formed as binary systems, meaning they were born in pairs, similar to the way many massive stars form ...