The view to Quarley HillThis morning, as I was writing chapter 2 of "Exopsychology" (it won't be on the web for a while yet) the new Roomba arrived (pictured below, feeding at its docking station).
The Roomba 530 preparing to workAfter an initial battery charge, it's trundling around the bedroom as I write.
More GR news. I knew about frame dragging, but hadn't realised that it can be thought about within the paradigm of gravitomagnetism: an analogy to the way magnetism arises from electrostatics + special relativity. What a great concept! And an intriguing experimental result here from Martin Tajmar.