The troll's undisguised contempt for Tillerson leaves the US unable to negotiate with North Korea or even to calm the tensions.

Tools for probing sites and networks can be useful for journalists, not just for crackers.

Global heating is making toxic blooms of cyanobacteria more frequent in some lakes, such as Lake Erie.

US citizens: support the Restricting the First Use of Nuclear Weapons Act, which would deny the president the authority to start a nuclear war.

In Australia, toxic foam used to extinguish fires has got into drinking water supplies.