Abstract: A stable Cartesian grid staircase-free finite-difference time-domain formulation for arbitrary material distributions in general geometries is introduced. It is shown that the method ...

While it is tempting to take the lift or escalator rather than use the stairs, even scaling just a few flights a day could give your health and mind a boost. As expeditions go, it was a gruelling one.

Eagle-eyed househunters have flagged concerns over an unusual set of stairs in a London bedroom. The stairs are located on the top floor of a two-bedroom flat in Brockley. A long, narrow hatch ...