A federal appeals court struck down most of President Trump's Congress-averting global import tariffs Friday in a dispute that's predicted to head to the US Supreme Court.

Radioactive water from a Royal Navy nuclear weapons base leaked into a loch after old pipes repeatedly burst, according to official files.

Tariffs are taxes on international trade. Here's everything you need to know about trade barriers and tariffs, why they are used, and their effects on the local economy.