When the results of the Joint Entrance Examination (JEE) come out each year, one number quietly decides a teenager’s academic destiny. Campus, branch, hostel, peer group. For decades, that decision ...

Advances in organ and computer models are raising the prospect that some animal experiments could be eliminated. But there are still huge hurdles to overcome.

As tech companies and governments fill the night sky with satellites, some astronomers are urging caution about creating a “dumping ground’’ in orbit.