Meanwhile, President Donald Trump has told a White House event the US is striking Iranian drone and missile systems "every single hour".

A ring of 13 carbon atoms and two chlorine atoms has a remarkable molecular structure that means you would have to go around the loop four times to return to your starting position ...

Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics attempts ...