The US president says he is "disappointed" in Putin and will be sending "top-of-the-line" weapons to Ukraine, via Nato.

President Trump is pushing through with his tariff agenda, unveiling a new batch of letters to country leaders outlining ...

Can you prove whether a large quantum system truly behaves according to the weird and wonderful rules of quantum mechanics—or ...

For nearly a century, scientists around the world have been searching for dark matter—an invisible substance believed to make ...