The message attributed to Mojtaba Khamenei was read by a presenter on Iranian state TV. He has not been seen in public since succeeding his father.

A new study in the journal Nature Cities shows that as temperatures rise aboveground, the number of subway riders reporting uncomfortable heat belowground increases. Northwestern University researcher ...

A Republican push to alter the census may lead to a radical shift in redistricting for state legislatures — drawing districts that don't take into account children and non-U.S. citizen adults.

Three Palestinians have died in a clash with Israeli settlers in the occupied West Bank, as violence has spiked during new ...