For more than a century, physicists debated which way a submerged sprinkler sucking in water would spin. Careful experiments ...

Want a big-screen phone that folds in half and slides right into your pocket? Here's everything you need to know about these nifty dual-display devices, along with our top tested picks. I’m one of ...

I spent weeks using flip and book-style devices from Samsung, Motorola, Honor and more – and five stood out Jon is a freelance journalist for Telegraph Recommended, specialising in consumer technology ...